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Topic 20 - Cardiovascular Physiology

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Physiology Quiz on Topic 20 - Cardiovascular Physiology, created by Felicity B on 11/10/2017.
Felicity B
Quiz by Felicity B, updated more than 1 year ago
Felicity B
Created by Felicity B about 7 years ago
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Resource summary

Question 1

Question
A blood vessel that takes blood away from the heart is called a/an
Answer
  • Artery
  • Vein
  • Capillary
  • Ventricle

Question 2

Question
The heart chamber that pumps oxygen depleted blood to the lungs is the
Answer
  • Right atrium
  • Right ventricle
  • Left atrium
  • Left ventricle

Question 3

Question
The systemic circulation
Answer
  • Begins with oxygen rich blood entering the aorta
  • Supplies blood to all tissues of the body
  • Ends with oxygen depleted blood entering the right atrium
  • All of the above

Question 4

Question
Cardiac muscle cells are electrically connected via
Answer
  • Desmosomes
  • Gap junctions
  • Striations
  • Motor units

Question 5

Question
TRUE or FALSE The series of events that create an Action Potential in a neuron are exactly the same as those that create and Action Potential in a cardiac muscle cell
Answer
  • True
  • False

Question 6

Question
TRUE or FALSE The normally functioning cardiac muscle cell always completely relaxes prior to contracting again due to calcium influx that lengthens the refractory period
Answer
  • True
  • False

Question 7

Question
TRUE or FALSE All cardiac muscle cells can spontaneously generate action potentials.
Answer
  • True
  • False

Question 8

Question
In myocardial autorhythmic cells (pacemaker cells), when threshold is reached the action potential fires because
Answer
  • Voltage gated sodium channels open and sodium rushes into the cell
  • Voltage gated calcium channels open and calcium rushes into the cell
  • Voltage gated potassium channels open and potassium rushes out of the cell
  • Increased leaky channels open and there is net sodium influx

Question 9

Question
In pacemaker cells, decreased permeability to calcium will
Answer
  • Increase heart rate
  • Decrease heart rate
  • Have no effect on heart rate
  • Increase force of muscle contraction

Question 10

Question
Parasympathetic nervous stimulation onto pacemaker cells results in
Answer
  • Increased heart rate
  • Decreased heart rate
  • No change in heart rate
  • Increased force of muscle contraction

Question 11

Question
TRUE or FALSE Once pacemaker cells have fired an action potential, this depolarisation spreads throughout the rest of the cardiac muscle cells via the gap junctions
Answer
  • True
  • False

Question 12

Question
1. In a normally functioning heart the pacemaker cells are in the
Answer
  • Sinoatrial (SA) node
  • Atrioventricular (AV) node
  • Autonomic nerves
  • Purkinje fibres

Question 13

Question
TRUE or FALSE In a normal cardiac cycle, the ventricles contract first, followed by the atria
Answer
  • True
  • False

Question 14

Question
In an ECG reading, the T wave represents
Answer
  • Depolarisation of the atria
  • Depolarisation of the ventricles
  • Repolarisation of the ventricles
  • Force of contraction

Question 15

Question
1. The relaxation phase of the cardiac cycle is called
Answer
  • Diastole
  • Systole
  • Depolarisation
  • Isovolumic ventricular contraction

Question 16

Question
During the cardiac cycle the phase when the ventricles are contracting and blood is being ejected into the arteries is called
Answer
  • Diastole
  • Systole
  • Depolarisation
  • Isovolumic ventricular contraction

Question 17

Question
When the atrioventricular valves are open
Answer
  • Blood is flowing from the ventricles into the atria
  • Blood is flowing from the atria into the ventricles
  • Blood is being ejected from ventricles into arteries
  • Blood is being ejected from atria into veins

Question 18

Question
In order for the semilunar valves to be shut
Answer
  • The pressure in the ventricles must exceed the pressure in the arteries
  • The pressure in the arteries must exceed the pressure in the ventricles
  • The atrioventricular valves must also be shut
  • The atrioventricular valves must also be open

Question 19

Question
When pressure in the atrium exceeds pressure in the ventricle, this will cause
Answer
  • The AV valve to close
  • The AV valve to open
  • The semilunar valve to open
  • The semilunar valve to close

Question 20

Question
The volume of blood in the ventricle at the end of diastole is known as
Answer
  • The end diastolic volume (EDV)
  • The end systolic volume (ESV)
  • The stroke volume (SV)
  • The isovolumic volume

Question 21

Question
TRUE or FALSE During each cardiac cycle, the ventricle ejects the full volume of blood that it contains so there is no blood left in the ventricle at the end of systole
Answer
  • True
  • False

Question 22

Question
Average stroke volume (SV) of a person at rest is approximately
Answer
  • 135 mL
  • 65 mL
  • 70 mL
  • 100 mL

Question 23

Question
Cardiac Output is a measure of the volume of blood pumped by one ventricle in a given period of time. It is equal to
Answer
  • Heart rate X end diastolic volume (EDV)
  • Heart rate X stroke volume (SV)
  • Heart rate X systolic blood pressure
  • Heart rate X total peripheral resistance

Question 24

Question
TRUE or FALSE Average resting heart rate is about 70 beats per minute due to tonic input from the sympathetic nervous system that keeps the heart rate lower than that which is set by the pacemaker cells
Answer
  • True
  • False

Question 25

Question
If force of ventricular contraction is increased, what happens to stroke volume
Answer
  • Decreases
  • Increases
  • Stays same
  • It lowers heart rate

Question 26

Question
According to the Frank-Starling law, stroke volume (SV) increases as end diastolic volume (EDV) increases due to
Answer
  • Increased sympathetic stimulation of the heart causing increased contraction of ventricles
  • Increased stretch on myocardial cells due to increased EDV, resulting in increased contraction force
  • Increased EDV causes increased heart rate and hence increased SV
  • Venous return decreases with increased EDV so SV must be increased to compensate

Question 27

Question
What is venous return?
Answer
  • The amount of blood ejected from a ventricle in one cardiac cycle
  • The amount of blood that is pumped into the veins from the atria in one cardiac cycle
  • The amount of blood that enters the heart from the veins each cardiac cycle
  • The amount of blood that enters the systemic circulation each cardiac cycle

Question 28

Question
Which factors influence venous return?
Answer
  • The skeletal muscle pump
  • The respiratory pump
  • Sympathetic innervation of veins
  • All of the above

Question 29

Question
TRUE or FALSE When sympathetic neurons fire onto the heart, both heart rate and force of contraction are increased
Answer
  • True
  • False
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