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PMU - Year 1 Physics - Part 1

Descrição

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.
Sole C
Quiz por Sole C, atualizado more than 1 year ago
Sole C
Criado por Sole C mais de 9 anos atrás
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Resumo de Recurso

Questão 1

Questão
Acoustic (sound) Impedance Za of a substance is equal to the product of:
Responda
  • 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

Questão 2

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

Questão 3

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

Questão 4

Questão
Main characteristic of the noise is:
Responda
  • 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.

Questão 5

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

Questão 6

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

Questão 7

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

Questão 8

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

Questão 9

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

Questão 10

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

Questão 11

Questão
Which condition is least significant for sound reflection:
Responda
  • 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

Questão 12

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

Questão 13

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

Questão 14

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

Questão 15

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

Questão 16

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

Questão 17

Questão
The pitch of sound is determined mainly by:
Responda
  • Sound Intensity
  • Sound Pressure
  • Sound Frequency

Questão 18

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

Questão 19

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

Questão 20

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

Questão 21

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

Questão 22

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

Questão 23

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

Questão 24

Questão
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?:
Responda
  • Will increase by a factor of 10 (times 10)
  • Will double (times 2)
  • Will increase with 20 dB (plus 20dB)

Questão 25

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

Questão 26

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

Questão 27

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

Questão 28

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

Questão 29

Questão
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)
Responda
  • 60 dB
  • 40 dB
  • 40 phons
  • 50 phons

Questão 30

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

Questão 31

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

Questão 32

Questão
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".
Responda
  • Auscultation
  • Percussion
  • Audiometry
  • Phonocardiography.

Questão 33

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

Questão 34

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

Questão 35

Questão
Auscultation is:
Responda
  • Ultrasound Diagnostic;
  • Sound based Therapy
  • Sound based diagnostic
  • Infrasound Diagnostic

Questão 36

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

Questão 37

Questão
Hearing loss diagnostic based on variation of sound frequency:
Responda
  • Auscultation
  • Percussion
  • Audiometry
  • Phonocardiography

Questão 38

Questão
Mechanical waves used for breaking renal calculi (extra-corporeal lithotripsy) does not injure surrounding tissue because:
Responda
  • 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

Questão 39

Questão
The main characteristic of noise is:
Responda
  • 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

Questão 40

Questão
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)
Responda
  • k
  • d
  • e

Questão 41

Questão
How does intensity of noise vary with the distance from the source?
Responda
  • 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)

Questão 42

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

Questão 43

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

Questão 44

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

Questão 45

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

Questão 46

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

Questão 47

Questão
The phenomenon reverse piezoelectric effect finds application in:
Responda
  • Generators of US
  • Detectors of US
  • Thermometers

Questão 48

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

Questão 49

Questão
Ultrasound propagates through body fluids as
Responda
  • Longitudinal Waves
  • Transverse Waves
  • Both Longitudinal and Transverse Waves

Questão 50

Questão
US propagates in the bones as
Responda
  • Longitudinal Waves
  • Transverse Waves
  • Longitudinal and Transverse waves

Questão 51

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

Questão 52

Questão
Ultrasound propagates to a lesser depth in tissues compared to IS because:
Responda
  • 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

Questão 53

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

Questão 54

Questão
What is the purpose of the contact gel used in echography:
Responda
  • 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

Questão 55

Questão
In echography, tissues are examined with:
Responda
  • Permanent magnetic field
  • Ultrasound
  • Electric field

Questão 56

Questão
The contact gel must have:
Responda
  • 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

Questão 57

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

Questão 58

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

Questão 59

Questão
During echography, the contact gel is used for:
Responda
  • 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

Questão 60

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

Questão 61

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

Questão 62

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

Questão 63

Questão
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:
Responda
  • 440 Hz
  • 250 Hz
  • 62.5 Hz

Questão 64

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

Questão 65

Questão
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:
Responda
  • 5%
  • 0.5%
  • 0.05%

Questão 66

Questão
Sonophoresis is:
Responda
  • A drug sterilization method using ultrasound;
  • A therapeutic method using ultrasound
  • An ultrasound diagnostic

Questão 67

Questão
Pharmaceuticals applied with sonophoresis are:
Responda
  • Water-soluble only
  • Fat-soluble only
  • Either of them

Questão 68

Questão
Sonophoresis can transport
Responda
  • Ions only
  • Molecules
  • Either

Questão 69

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

Questão 70

Questão
Ultrasound Diathermy is procedure for:
Responda
  • Ultrasound Surgery
  • Ultrasound Diagnostic
  • Therapy with Ultrasound

Questão 71

Questão
Ultrasound diathermy causes tissue:
Responda
  • Deep Heating
  • Coagulation
  • Necrosis

Questão 72

Questão
Sonophoresis and Ionophoresis are both methods for:
Responda
  • Electrostimulation
  • Surgical Procedures
  • Transcutaneous drug delivery

Questão 73

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

Questão 74

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

Questão 75

Questão
IS does not propagate in:
Responda
  • Vacuum
  • Soft Biological Tissues
  • Bones

Questão 76

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

Questão 77

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

Questão 78

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

Questão 79

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

Questão 80

Questão
The phenomenon of diffraction is more common for:
Responda
  • Infrasound
  • Ultrasound
  • Audible Sound

Questão 81

Questão
Which Science is related to IS:
Responda
  • Pediatrics
  • Seismology
  • Dentistry
  • Archeology

Questão 82

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

Questão 83

Questão
What is the quantity transferred during diffusion:
Responda
  • Mass
  • Energy
  • Electric Charge

Questão 84

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

Questão 85

Questão
Quantity transferred by internal friction:
Responda
  • Energy
  • Impulse
  • Electric Charge

Questão 86

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

Questão 87

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

Questão 88

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

Questão 89

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

Questão 90

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

Questão 91

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

Questão 92

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

Questão 93

Questão
What is the physical meaning of cell membrane permeability, measured in m/s:
Responda
  • 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

Questão 94

Questão
What is the different between osmosis and diffusion:
Responda
  • 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

Questão 95

Questão
Which fluid phenomenon is used in hemodialysis:
Responda
  • Internal Friction
  • Diffusion
  • Osmosis

Questão 96

Questão
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)
Responda
  • 2/3 t
  • 4/3 t
  • 3/2 t
  • 1/2 t

Questão 97

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

Questão 98

Questão
Ideal Fluids are defined as:
Responda
  • p = const, n = const
  • p = const, n = 0
  • p = 0, n = const
  • p = 0, n = 0

Questão 99

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

Questão 100

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

Questão 101

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

Questão 102

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

Questão 103

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

Questão 104

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

Questão 105

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

Questão 106

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

Questão 107

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

Questão 108

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

Questão 109

Questão
Gas embolism is explained best with:
Responda
  • 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

Questão 110

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

Questão 111

Questão
Pulse wave velocity in people with atherosclerosis
Responda
  • Matches the speed of blood
  • Increases
  • Decreases

Questão 112

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

Questão 113

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

Questão 114

Questão
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:
Responda
  • Hypertension
  • Hypotension
  • Hypoxia

Questão 115

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

Questão 116

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

Questão 117

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

Questão 118

Questão
What causes the so called Korotkoff sounds
Responda
  • Laminar blood flow
  • Turbulent blood flow
  • Maximal blood flow

Questão 119

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

Questão 120

Questão
I would expect that the systolic blood pressure measured with the arm raised above the dead would be:
Responda
  • 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.

Questão 121

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

Questão 122

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

Questão 123

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

Questão 124

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

Questão 125

Questão
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 ........... .
Responda
  • Blood Vessels, The Heart
  • The Heart, Blood Vessels
  • Pulse Wave, The Heart
  • None of the above.

Questão 126

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

Questão 127

Questão
Surfactant facilitates breathing through
Responda
  • Reduction of intrapressure
  • Increase of frequency of breathing
  • Reduction of Alveoli surface tension

Questão 128

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

Questão 129

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

Questão 130

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

Questão 131

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

Questão 132

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

Questão 133

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

Questão 134

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

Questão 135

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

Questão 136

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

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