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PMU - Year 1 Physics - Part 1

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All Questions uploaded word for word from MCQ book. All Credit to Authors. Mistakes due in process may have been made, use and check your work at your own discretion. Only simple writing allowed, i.e Superscript and Subscript absent.
Ramtin Yeganeh
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Sole C
Created by Sole C about 9 years ago
Ramtin Yeganeh
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Question 1

Question
Acoustic (sound) Impedance Za of a substance is equal to the product of:
Answer
  • Density p and atomic number Z of the element - pZ;
  • Density p and velocity of sound v in substance - pv
  • Temperature T and velocity of sound v in the substance - Tv

Question 2

Question
The frequency of the sound is;
Answer
  • Physical (objective) characteristic of the sound;
  • Psycho-physical (subjective) characteristic of the sound;
  • Common term for objective and subjective characteristic of the sound.

Question 3

Question
The velocity of the sound is:
Answer
  • Physical (objective) characteristic of the sound
  • Psycho-physical (subjective) characteristic of the sound
  • Common term for objective and subjective characteristic of the sound

Question 4

Question
Main characteristic of the noise is:
Answer
  • Minimum amplitude and frequency which do not alter with the time;
  • Minimum frequency and amplitude which do not alter with the time;
  • Frequency and amplitude which continuously alter with the time.

Question 5

Question
In which frequency range the human ear has maximum sensitivity:
Answer
  • From 1000 to 3000 кНz;
  • From 1000 to 3000 МНz;
  • From 1000 to 3000 Нz.

Question 6

Question
The pitch of the sound is determined mainly by:
Answer
  • Intensity of the sound;
  • Sound pressure;
  • Sound frequency.

Question 7

Question
The fundamental tone f0 in a complex sound has:
Answer
  • Minimum amplitude and maximum frequency;
  • Minimum frequency and maximum amplitude;
  • Medium frequency and amplitude.

Question 8

Question
Sound can propagate in;
Answer
  • Vacuum;
  • Any substance;
  • Any medium through which the electromagnetic waves also propagate.

Question 9

Question
Sound wavelength in the hearing band is longer than that of:
Answer
  • Pulse Wave
  • Infrasound
  • Ultrasound

Question 10

Question
Reflection coefficient a2 (Alpha) of sound at the boundary between two media with sound impedance Z1 and Z2 is determined by the expression:
Answer

Question 11

Question
Which condition is least significant for sound reflection:
Answer
  • Transverse size of the boundary surface to be longer than or equal to sound wavelength
  • Boundary between two media with different acoustic impedance's
  • Boundary between two media with different densities

Question 12

Question
When our heads are submerged in water we cannot hear people because;
Answer
  • Sound is reflected almost completely at the water surface
  • Sound does not propagate through water
  • Our ear canals are filled with water

Question 13

Question
Sound wave travels across two materials with similar acoustic impedance. At the boundary surface, we expect:
Answer
  • Similar amounts of transmission and reflection;
  • More transmission and less reflection;
  • less transmission and more reflection;

Question 14

Question
Sound timbre is;
Answer
  • A physical (objective) feature of sound
  • Psycho-physical (subjective) feature of the sound
  • A common term objective and subjective characteristic of the sound

Question 15

Question
The psycho-physical law of Weber–Fehner on the sound perception is used to define the quantity:
Answer
  • Sound (acoustic) pressure(p);
  • Sound pitch;
  • Intensity level(Е).

Question 16

Question
Human hearing has a maximum sensitivity at frequencies:
Answer
  • from 1000 to 3000 kHz
  • from 1000 to 3000 MHz
  • from 1000 to 3000 Hz

Question 17

Question
The pitch of sound is determined mainly by:
Answer
  • Sound Intensity
  • Sound Pressure
  • Sound Frequency

Question 18

Question
The operating frequency hearing range is:
Answer
  • 10 MHz - 100 MHz
  • 10 kHz - 10 MHz
  • 10 Hz - 10,000 Hz

Question 19

Question
Human Frequency hearing range is:
Answer
  • Below 20 Hz
  • From 20 to 20,000 MHz
  • Over 20,000 Hz

Question 20

Question
The subjective quantity "Intensity Level E" is defined at sound frequency:
Answer
  • 16 Hz
  • 20 kHz
  • 1 kHz

Question 21

Question
At what frequency is "Loudness L" approximately the same as "Sound Intensity Level"?
Answer
  • 1000 Hz
  • from 16 to 20,000 Hz
  • 1 MHz

Question 22

Question
Sound Intensity Level E is measured in units of:
Answer
  • Watt, W
  • Decibel, dB
  • Hertz, Hz

Question 23

Question
Sound Intensity Level "E" is equal to zero if:
Answer
  • I = Io
  • I > Io
  • I < Io
  • SIL is never 0

Question 24

Question
Sound Intensity Level (SIL) is proportional to the logarithm of the ratio of incoming to threshold intensity - 10*log(I/Io). During a test, incoming intensity is increased by a factor of 100. What will be the change in SIL?:
Answer
  • Will increase by a factor of 10 (times 10)
  • Will double (times 2)
  • Will increase with 20 dB (plus 20dB)

Question 25

Question
The timbre (quality) of a tone:
Answer
  • Decreases with loudness
  • Is proportional to the frequency
  • Is inversely proportional to the frequency
  • depends upon the overtones that are present

Question 26

Question
Is it possible for Humans to detect ultrasound?:
Answer
  • Not possible
  • Yes, the blue shift is visible
  • Yes, some frequencies cause a heating sensation.

Question 27

Question
Is it possible for humans to detect Infrasound:
Answer
  • Not possible
  • Yes, the red shift is visible
  • The body can sense certain vibrations

Question 28

Question
Timbre is related to:
Answer
  • Harmonic Overtones
  • Sound from a tuning fork
  • Noise from a medical apparatus

Question 29

Question
The Equal-loudness contour, introduced by Fletcher-Munson in 1933, was designed to correlate sound intensity to the subjective perception of loudness. Use the graph to estimate perceived loudness (In Phons!) at frequency 100hz and sound intensity level of 50 dB
Image:
a62d4fa5-86b9-44d6-bd9d-c9a5f479e898 (image/jpg)
Answer
  • 60 dB
  • 40 dB
  • 40 phons
  • 50 phons

Question 30

Question
During a standard audiogram procedure you hear sounds at intensity level of 0 dB. This is possible because:
Answer
  • Intensity of 10(-12) W/m2 is audible
  • Malfunction of the knob
  • Tympanic membrane can generate own sounds.
  • Your colleagues are too loud.

Question 31

Question
Percussion is a method for:
Answer
  • Ultrasound Diagnostic
  • Ultrasound therapy
  • Diagnostic with sound, produced by the Doctor.
  • Ultrasound diagnostic, based on reflections from organs.

Question 32

Question
W?hat diagnostic method is described in the following text? : "There are four types of sounds; Resonant, Hyper-Resonant, Stony Dull or Dull. A Dull sound indicates the presence of a solid mass under the surface. A more resonant sound indicates hollow, air-containing structures".
Answer
  • Auscultation
  • Percussion
  • Audiometry
  • Phonocardiography.

Question 33

Question
Simple (pure) tones with frequencies 0.125, 0.25, 0.5, 1, 2, 4 and 8 kHz, are used in:
Answer
  • Auscultation
  • Percussion
  • Audiometry
  • Phonocardiography

Question 34

Question
Sphygmomanometer is used for:
Answer
  • Atmospheric pressure in the hospital
  • Arterial blood pressure
  • Lungs Air Pressure

Question 35

Question
Auscultation is:
Answer
  • Ultrasound Diagnostic;
  • Sound based Therapy
  • Sound based diagnostic
  • Infrasound Diagnostic

Question 36

Question
What diagnostic method use sub-audible sounds and murmurs (infrared range) produced from the heart?
Answer
  • Auscultation
  • Percussion
  • Audiometry
  • Phonocardiography

Question 37

Question
Hearing loss diagnostic based on variation of sound frequency:
Answer
  • Auscultation
  • Percussion
  • Audiometry
  • Phonocardiography

Question 38

Question
Mechanical waves used for breaking renal calculi (extra-corporeal lithotripsy) does not injure surrounding tissue because:
Answer
  • Mechanical waves do not pass through the tissues
  • Acoustic pressure in tissues is several times lower than pressure in the calculi
  • Mechanical waves do not affect tissues

Question 39

Question
The main characteristic of noise is:
Answer
  • Minimum amplitude and frequency which do not alter with time
  • minimum frequency and amplitude which do not alter with time
  • frequency and amplitude which continuously altar with time

Question 40

Question
Consider the law of noise attenuation (figure). Which symbol refers to the type of material, noise-protection screens are made of?
Image:
0551f5e8-9f12-400d-bcdf-18d5a3c074d7 (image/png)
Answer
  • k
  • d
  • e

Question 41

Question
How does intensity of noise vary with the distance from the source?
Answer
  • proportional to the distance r
  • proportional to the square distance r(2)
  • inversely proportional to the distance r
  • inversely proportional to the square of the distance r(2)

Question 42

Question
The frequency of echograph, marked on the ultrasound probe, relates mostly to:
Answer
  • Spatial resolution
  • Depth of penetration
  • Velocity of US propagation

Question 43

Question
Velocity of US in biological tissues depend on:
Answer
  • Frequency, marked on echograph's transducer
  • US Wavelength
  • Type of Examined tissues

Question 44

Question
Ultrasound can propagate in:
Answer
  • Vacuum
  • Material Substance
  • Any media through which electromagnetic waves (light) can propagate

Question 45

Question
Reflection coefficient a(2) of US at the boundary between two media with impedance Z1 and Z2 is determined by the expression:
Answer

Question 46

Question
The phenomenon, direct piezoelectric effect finds application in:
Answer
  • Generators of US
  • Detectors of US
  • Parametric transducers

Question 47

Question
The phenomenon reverse piezoelectric effect finds application in:
Answer
  • Generators of US
  • Detectors of US
  • Thermometers

Question 48

Question
The phenomena direct and reverse piezoelectric effect find application in:
Answer
  • Contact gel, used in US imaging
  • Transducers of echo-graphs
  • Generators of alternating electric current

Question 49

Question
Ultrasound propagates through body fluids as
Answer
  • Longitudinal Waves
  • Transverse Waves
  • Both Longitudinal and Transverse Waves

Question 50

Question
US propagates in the bones as
Answer
  • Longitudinal Waves
  • Transverse Waves
  • Longitudinal and Transverse waves

Question 51

Question
What frequency ultrasound is appropriate for deep tissue scanning?
Answer
  • 8 MHz
  • 3 kHz
  • 3 MHz
  • 20 MHz

Question 52

Question
Ultrasound propagates to a lesser depth in tissues compared to IS because:
Answer
  • Speed of propagation of US in tissues is slower
  • US is reflected off tissue structures with smaller cross-sectional dimensions
  • Acoustic impedance Za of tissues is lower for US

Question 53

Question
Diagnostic imaging method that uses the phenomenon of reflection:
Answer
  • Positron-emission tomography (PET)
  • Echography
  • Roentgen Diagnostics

Question 54

Question
What is the purpose of the contact gel used in echography:
Answer
  • To reflect US at the boundary of air and skin
  • To create an acoustically continuous medium for US propagation
  • To decrease harmful effects of US on the skin

Question 55

Question
In echography, tissues are examined with:
Answer
  • Permanent magnetic field
  • Ultrasound
  • Electric field

Question 56

Question
The contact gel must have:
Answer
  • Density p equal to the mean density of soft tissues
  • Chemical composition similar to that of soft tissues
  • Acoustic impedance Za equal to the average acoustic impedance of soft tissues

Question 57

Question
In A-mode ultrasound, the difference in acoustic impedance of tissues is depicted on the monitor as:
Answer
  • Spikes with different amplitudes
  • Dots with different brightness
  • Regions in different colours (the arteries in red; the veins in blue)

Question 58

Question
In B-mode ultrasound, the difference in acoustic impedance of tissue is depicted on the monitor as:
Answer
  • Spikes with different amplitudes
  • Dots with different brightness
  • Regions in different colours (the arteries in red; the veins in blue)

Question 59

Question
During echography, the contact gel is used for:
Answer
  • Near 100% reflection of ultrasound at the air-skin boundary
  • Near 100% absorption of ultrasound in patient's skin
  • Near 100% transmission of ultrasound through the skin

Question 60

Question
M-mode ultrasound is used for:
Answer
  • Immovable body structures
  • Movable body structures
  • Regions of the lung with pneumothorax.

Question 61

Question
The ultrasound technique called Colour Doppler is used to obtain information about:
Answer
  • Macro-circulation of blood:
  • Bone metastases
  • Glucose metabolism

Question 62

Question
Diagnostic imaging method based on Reflection:
Answer
  • Positron-emission tomography (PET)
  • Colour Doppler
  • Computed-tomography (CT)
  • Roentgenography

Question 63

Question
In a Doppler experiment, a probe frequency of 4 MHz corresponds to a frequency shift of 125 Hz. If probe frequency is now doubled to 8 MHz, what would be the expected frequency shift:
Answer
  • 440 Hz
  • 250 Hz
  • 62.5 Hz

Question 64

Question
A diagnostic US imaging instrument uses a frequency of 6 MHz. What is the corresponding wavelength in soft tissues in the body:
Answer
  • 200 micrometre's
  • 20 micrometre's
  • 2 micrometre's
  • 0.2 micrometre's

Question 65

Question
Speed of blood flow could be as fast as v=75 cm/s, what is the ratio (in %) of speed of blood to the speed of ultrasound in soft tissue:
Answer
  • 5%
  • 0.5%
  • 0.05%

Question 66

Question
Sonophoresis is:
Answer
  • A drug sterilization method using ultrasound;
  • A therapeutic method using ultrasound
  • An ultrasound diagnostic

Question 67

Question
Pharmaceuticals applied with sonophoresis are:
Answer
  • Water-soluble only
  • Fat-soluble only
  • Either of them

Question 68

Question
Sonophoresis can transport
Answer
  • Ions only
  • Molecules
  • Either

Question 69

Question
High Intensity Focused Ultrasound (HIFU) procedure is:
Answer
  • Ultrasound surgery
  • Ultrasound diagnostic
  • Physical therapy with ultrasound

Question 70

Question
Ultrasound Diathermy is procedure for:
Answer
  • Ultrasound Surgery
  • Ultrasound Diagnostic
  • Therapy with Ultrasound

Question 71

Question
Ultrasound diathermy causes tissue:
Answer
  • Deep Heating
  • Coagulation
  • Necrosis

Question 72

Question
Sonophoresis and Ionophoresis are both methods for:
Answer
  • Electrostimulation
  • Surgical Procedures
  • Transcutaneous drug delivery

Question 73

Question
Infrasound (IR) of certain frequencies can cause:
Answer
  • Resonant vibration, and damage to internal organs
  • Deep penetration into tissues
  • Change in Propagation Velocity
  • Energy Deposition in Tissues

Question 74

Question
The speed of IS propagation, in certain medium, depends on:
Answer
  • The Frequency of IS
  • The Wavelength of IS
  • The Properties of the Medium

Question 75

Question
IS does not propagate in:
Answer
  • Vacuum
  • Soft Biological Tissues
  • Bones

Question 76

Question
Wavelengths of infrasound are shorter than:
Answer
  • Ultrasound
  • Audible sound
  • Sound with frequency of 3 kHz
  • None of the above

Question 77

Question
The resonant frequency of cardiac activity is in the:
Answer
  • Ultrasound Range
  • Infrasound Range
  • Frequency of about 10 MHz

Question 78

Question
The resonant frequency of vestibular apparatus is within:
Answer
  • Sound frequency of about 10 MHz
  • The Infrasound
  • The Ultrasound

Question 79

Question
The resonant frequency of Internal Organs is within:
Answer
  • Sound frequency of about 10 MHz
  • The Ultrasound
  • The Infrasound

Question 80

Question
The phenomenon of diffraction is more common for:
Answer
  • Infrasound
  • Ultrasound
  • Audible Sound

Question 81

Question
Which Science is related to IS:
Answer
  • Pediatrics
  • Seismology
  • Dentistry
  • Archeology

Question 82

Question
Which of the following is not true for earthquakes?
Answer
  • They are Longitudinal sound waves
  • They are transverse sound waves
  • Frequency is in the ultrasound range

Question 83

Question
What is the quantity transferred during diffusion:
Answer
  • Mass
  • Energy
  • Electric Charge

Question 84

Question
The quantity transferred during heat conduction is:
Answer
  • Impulse
  • Mass
  • Energy (Quantity of Heat)

Question 85

Question
Quantity transferred by internal friction:
Answer
  • Energy
  • Impulse
  • Electric Charge

Question 86

Question
A necessary condition for the process of diffusion is the availability of:
Answer
  • Semi-permeable membrane
  • Temperature Gradient
  • Concentration Gradient

Question 87

Question
A necessary condition for the process of internal friction is:
Answer
  • Concentration Gradient
  • Velocity gradient, in a direction perpendicular to the direction of fluid motion
  • Difference in the concentration of free electrons

Question 88

Question
A necessary condition for heat conduction is:
Answer
  • Temperature higher than the absolute zero
  • Difference in concentration (concentration gradient)
  • Temperature gradient

Question 89

Question
High heat conductivity of metals is explained by:
Answer
  • Higher Density
  • Free electrons in their crystals
  • Their smooth surface

Question 90

Question
Wet clothes make you feel cold because:
Answer
  • Thermal conductivity of water is higher than that of air:
  • It is only a subjective sensation
  • Wet clothes increase the total mass

Question 91

Question
Which organs and tissues of the human body have the least heat conductivity:
Answer
  • Muscles
  • The Brain
  • Skin and Fat Tissue

Question 92

Question
Which organs and tissues have the greatest heat conductivity
Answer
  • The Blood
  • The Brain
  • Skin and Fat Tissue

Question 93

Question
What is the physical meaning of cell membrane permeability, measured in m/s:
Answer
  • The cross section of ion-channels (ionic channels), in the cell membrane
  • The speed of ions passing across the cell membrane
  • The density of cell membrane

Question 94

Question
What is the different between osmosis and diffusion:
Answer
  • In osmosis, the solvent moves in order to equalize concentrations; in diffusion - the solute moves
  • Osmosis is a special case of diffusion
  • There is no difference

Question 95

Question
Which fluid phenomenon is used in hemodialysis:
Answer
  • Internal Friction
  • Diffusion
  • Osmosis

Question 96

Question
Consider Fick's Law (Figure) of diffusion, If contact surface is doubled and concentration gradient is reduced by a third, how can we adjust exposure time, to ensure the same total mass transfer:
Image:
7215bef8-355f-469a-9957-da2ccd2c5bdb (image/png)
Answer
  • 2/3 t
  • 4/3 t
  • 3/2 t
  • 1/2 t

Question 97

Question
The two properties of ideal fluids (liquid) are:
Answer
  • Incompressibility and absence of internal friction
  • Fluidity and low density
  • Molecular pressure and surface tension

Question 98

Question
Ideal Fluids are defined as:
Answer
  • p = const, n = const
  • p = const, n = 0
  • p = 0, n = const
  • p = 0, n = 0

Question 99

Question
Newtonian fluids (blood in large vessels) have density p and dynamic viscosity n as:
Answer
  • p = const, n = const
  • p = const, n = 0
  • p = 0, n = const
  • p = not const, n = not const

Question 100

Question
Non-newtonian fluids (blood in small vessels) are characterized by density - p, dynamic viscosity n; as follows
Answer
  • p = const, n = const
  • p = const, n = 0
  • p = 0, n = const
  • p = not const, n = not const

Question 101

Question
The role of surfactant in the alveoli of lungs is to reduce:
Answer
  • The surface tension coefficient
  • The molecular pressure
  • The dimensions of the alveoli

Question 102

Question
The additional (Laplace) pressure Change-P does not depend on:
Answer
  • The cross-sectional area - S, of blood vessel
  • The atmospheric pressure - b
  • The surface tension coefficient

Question 103

Question
The flow-ability (fluidity) of blood is determined by the value of:
Answer
  • Surface Tension Coefficient
  • Density - p
  • Dynamic Viscosity - n

Question 104

Question
Fluidity of which body liquid is much lower than the rest:
Answer
  • Blood
  • Synovial fluid
  • Urine

Question 105

Question
Let n be the dynamic viscosity of a liquid, and n-water = dynamic viscosity of water. The relative viscosity is given by:
Answer
  • The difference (n - nwater)
  • The sum (n + nwater)
  • The ratio (n/nwater)
  • The ration nwater/n

Question 106

Question
Relative viscosity is a dimensionless quantity, because it is:
Answer
  • Empirically determined
  • A ratio of two quantities
  • Equal to the dynamic viscosity which is a dimensionless quantity

Question 107

Question
Obstruction of blood vessels by gas bubbles (embolism) can be contributed to:
Answer
  • Reynolds number (Re)
  • Dynamic viscosity n of the blood
  • Additional (Laplace) pressure Change-p

Question 108

Question
Pulse wave velocity depends primarily on:
Answer
  • The Hematocrit (relative volume of erythrocytes in blood)
  • The elasticity of blood vessels
  • The cross section of blood vessels

Question 109

Question
Gas embolism is explained best with:
Answer
  • Sound impedance at the boundary of air and blood
  • The half-life of a radionuclide introduced in the blood
  • Change in additional (Laplace) pressure "change-p" of blood

Question 110

Question
What is a pulse wave?
Answer
  • Propagation of elastic deformation along the walls of arterial vessels
  • Periodic contractions of the cardiac muscle (myocard)
  • The cause for gas or fat embolism

Question 111

Question
Pulse wave velocity in people with atherosclerosis
Answer
  • Matches the speed of blood
  • Increases
  • Decreases

Question 112

Question
The most informative quantity about Vascularity of organ is:
Answer
  • Arterial blood pressure
  • Speed of the blood
  • Volume flow rate

Question 113

Question
Reynolds number Re for blood fluid describes:
Answer
  • Contractibility
  • Type of motion - Laminar or turbulent
  • Flowability (fluidity)

Question 114

Question
In a microgravity environment, such as the International Space Station, blood flow is not subjected to gravitational forces. This leads to reduction of the heart rate and the cardiac output. Upon return to earth cosmonauts often faint. This is due to:
Answer
  • Hypertension
  • Hypotension
  • Hypoxia

Question 115

Question
In the cardiovascular system, what physical quantity is preserved to assure a proper function:
Answer
  • Total pressure
  • Blood velocity
  • Volume Flow Rate

Question 116

Question
In auscultation blood pressure measurement, systolic pressure is indicated by:
Answer
  • The maximum loudness of sounds
  • The first detection of sounds
  • The disappearance of sounds

Question 117

Question
In auscultation blood pressure measurement, Diastolic pressure is indicated by:
Answer
  • The maximum loudness of sounds
  • The first detection of sounds
  • The disappearance of sounds

Question 118

Question
What causes the so called Korotkoff sounds
Answer
  • Laminar blood flow
  • Turbulent blood flow
  • Maximal blood flow

Question 119

Question
I would expect that, together with a sphygmomanometer, the finger pulse detector:
Answer
  • Could not be used to determine diastolic pressure
  • Could be used to determine diastolic pressure
  • Could not be used to determine systolic pressure

Question 120

Question
I would expect that the systolic blood pressure measured with the arm raised above the dead would be:
Answer
  • No different from that measured with the arm in its normal position.
  • Higher than that measured with the arm in its normal position.
  • Lower than that measured with the arm in its normal position.

Question 121

Question
The terms systole and diastole usaully refer to the ........... and ............. , respectively, of the ............. .
Answer
  • Relaxation, contraction, ventricles
  • Contraction, relaxation, ventricles
  • Relaxation, contraction, atria
  • Contraction, relaxation, aria
  • None of the above

Question 122

Question
The lower bound of blood pressure in "Arteria Brachialis", is determined (stethoscope) from what type of sounds:
Answer
  • Infrasounds
  • Ultrasounds
  • Noises caused by a turbulent motion
  • Disappearance of noises, after return to a laminar motion.

Question 123

Question
The optimal blood pressure is considered to be:
Answer
  • 120/80 mm Hg
  • 130/85 mm Hg
  • 140/90 mm Hg

Question 124

Question
Normal blood pressure is considered to be:
Answer
  • 120/80 mm Hg
  • 130/85 mm Hg
  • 140/90 mm Hg

Question 125

Question
Choose the correct match: Upper bound arterial blood pressure depends on the condition of ............. ; Lower bound of arterial blood pressure depends on the condition of ........... .
Answer
  • Blood Vessels, The Heart
  • The Heart, Blood Vessels
  • Pulse Wave, The Heart
  • None of the above.

Question 126

Question
Define the sub-pressure in the intrapleural space:
Answer
  • Pressure lower than the atmospheric pressure
  • Negative pressure, i.e pressure with negative sign
  • Pressure lower than the blood pressure.

Question 127

Question
Surfactant facilitates breathing through
Answer
  • Reduction of intrapressure
  • Increase of frequency of breathing
  • Reduction of Alveoli surface tension

Question 128

Question
The role of the surfactant in the lungs is to make changes in:
Answer
  • Alveolar Radius
  • Alveolar surface tension coefficient
  • molecular pressure p-coh

Question 129

Question
Inspiration is:
Answer
  • An active process with the participation of surfactant
  • A passive process
  • None of the Above

Question 130

Question
What is the approximate volume of air in one inspiration:
Answer
  • 0.5 L
  • 1.0 L
  • 200 ml

Question 131

Question
The expiration is:
Answer
  • An active process with participation of a surfactant
  • A Passive process
  • An active process without participation of a surfactant

Question 132

Question
Difficult breathing in long-term smokers is due to:
Answer
  • Reduced secretion of surfactant in the alveoli
  • Weakening of breathing muscles
  • Pathological changes in the upper respiratory tracts

Question 133

Question
What physical phenomenon is associated with a physiological process involving a surfactant:
Answer
  • Internal friction and breathing
  • Surface tension and breathing
  • Harmonious vibration of the breathing and circulation of blood

Question 134

Question
During inhalation (breathing in) air moves into the lungs due to:
Answer
  • Diffusion
  • The force of gravity
  • Pressure difference.

Question 135

Question
During respiration Oxygen and CO2 are exchanges in the alveoli due to:
Answer
  • Diffusion
  • Pressure difference
  • Osmotic pressure

Question 136

Question
At higher elevations breathing frequency is increased to compensate for:
Answer
  • Lower Gravity
  • Higher Blood Pressure
  • Lower Atmospheric Pressure
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