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Physiology Quiz on Topic 20 - Cardiovascular Physiology, created by Felicity B on 11/10/2017.

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Felicity B
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Topic 20 - Cardiovascular Physiology

Question 1 of 29

1

A blood vessel that takes blood away from the heart is called a/an

Select one of the following:

  • Artery

  • Vein

  • Capillary

  • Ventricle

Explanation

Question 2 of 29

1

The heart chamber that pumps oxygen depleted blood to the lungs is the

Select one of the following:

  • Right atrium

  • Right ventricle

  • Left atrium

  • Left ventricle

Explanation

Question 3 of 29

1

The systemic circulation

Select one of the following:

  • 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

Explanation

Question 4 of 29

1

Cardiac muscle cells are electrically connected via

Select one of the following:

  • Desmosomes

  • Gap junctions

  • Striations

  • Motor units

Explanation

Question 5 of 29

1

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

Select one of the following:

  • True
  • False

Explanation

Question 6 of 29

1

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

Select one of the following:

  • True
  • False

Explanation

Question 7 of 29

1

TRUE or FALSE All cardiac muscle cells can spontaneously generate action potentials.

Select one of the following:

  • True
  • False

Explanation

Question 8 of 29

1

In myocardial autorhythmic cells (pacemaker cells), when threshold is reached the action potential fires because

Select one of the following:

  • 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

Explanation

Question 9 of 29

1

In pacemaker cells, decreased permeability to calcium will

Select one of the following:

  • Increase heart rate

  • Decrease heart rate

  • Have no effect on heart rate

  • Increase force of muscle contraction

Explanation

Question 10 of 29

1

Parasympathetic nervous stimulation onto pacemaker cells results in

Select one of the following:

  • Increased heart rate

  • Decreased heart rate

  • No change in heart rate

  • Increased force of muscle contraction

Explanation

Question 11 of 29

1

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

Select one of the following:

  • True
  • False

Explanation

Question 12 of 29

1

1. In a normally functioning heart the pacemaker cells are in the

Select one of the following:

  • Sinoatrial (SA) node

  • Atrioventricular (AV) node

  • Autonomic nerves

  • Purkinje fibres

Explanation

Question 13 of 29

1

TRUE or FALSE In a normal cardiac cycle, the ventricles contract first, followed by the atria

Select one of the following:

  • True
  • False

Explanation

Question 14 of 29

1

In an ECG reading, the T wave represents

Select one of the following:

  • Depolarisation of the atria

  • Depolarisation of the ventricles

  • Repolarisation of the ventricles

  • Force of contraction

Explanation

Question 15 of 29

1

1. The relaxation phase of the cardiac cycle is called

Select one of the following:

  • Diastole

  • Systole

  • Depolarisation

  • Isovolumic ventricular contraction

Explanation

Question 16 of 29

1

During the cardiac cycle the phase when the ventricles are contracting and blood is being ejected into the arteries is called

Select one of the following:

  • Diastole

  • Systole

  • Depolarisation

  • Isovolumic ventricular contraction

Explanation

Question 17 of 29

1

When the atrioventricular valves are open

Select one of the following:

  • 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

Explanation

Question 18 of 29

1

In order for the semilunar valves to be shut

Select one of the following:

  • 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

Explanation

Question 19 of 29

1

When pressure in the atrium exceeds pressure in the ventricle, this will cause

Select one of the following:

  • The AV valve to close

  • The AV valve to open

  • The semilunar valve to open

  • The semilunar valve to close

Explanation

Question 20 of 29

1

The volume of blood in the ventricle at the end of diastole is known as

Select one of the following:

  • The end diastolic volume (EDV)

  • The end systolic volume (ESV)

  • The stroke volume (SV)

  • The isovolumic volume

Explanation

Question 21 of 29

1

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

Select one of the following:

  • True
  • False

Explanation

Question 22 of 29

1

Average stroke volume (SV) of a person at rest is approximately

Select one of the following:

  • 135 mL

  • 65 mL

  • 70 mL

  • 100 mL

Explanation

Question 23 of 29

1

Cardiac Output is a measure of the volume of blood pumped by one ventricle in a given period of time. It is equal to

Select one of the following:

  • 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

Explanation

Question 24 of 29

1

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

Select one of the following:

  • True
  • False

Explanation

Question 25 of 29

1

If force of ventricular contraction is increased, what happens to stroke volume

Select one of the following:

  • Decreases

  • Increases

  • Stays same

  • It lowers heart rate

Explanation

Question 26 of 29

1

According to the Frank-Starling law, stroke volume (SV) increases as end diastolic volume (EDV) increases due to

Select one of the following:

  • 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

Explanation

Question 27 of 29

1

What is venous return?

Select one of the following:

  • 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

Explanation

Question 28 of 29

1

Which factors influence venous return?

Select one of the following:

  • The skeletal muscle pump

  • The respiratory pump

  • Sympathetic innervation of veins

  • All of the above

Explanation

Question 29 of 29

1

TRUE or FALSE When sympathetic neurons fire onto the heart, both heart rate and force of contraction are increased

Select one of the following:

  • True
  • False

Explanation

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