Question 1

Complete each of the following statements with increases, decreases, or has no effect on.
An increase in the length of the cardiac muscle fibers prior to contraction ____________________ the number of heart sounds heard.

Accepted Answer

The answer of Complete each of the following statements with...

Question 2

Norepinephrine increases calcium permeability in cardiac muscle cells and thus increases the heart's contractility.

Accepted Answer

A) True 
 B)False

Question 3

Complete each of the following statements with increases, decreases, or has no effect on.
Becoming more physically fit ____________________ a person's cardiac reserve.

Accepted Answer

The answer of Complete each of the following statements with...

Question 4

According to the Frank-Starling law of the heart, the shorter the initial length of the cardiac muscle fibers prior to contraction, the more forceful will be the subsequent contraction because the fibers are already partially contracted.

Accepted Answer

A) True 
 B)False

Question 5

What percentage of ventricular filling is normally accomplished before atrial contraction begins?

Accepted Answer

A)   0%
B)   20%
C)   80%
D)   50%
E)   100%

Question 6

According to the Frank-Starling law of the heart,

Accepted Answer

A)   Shortening cardiac muscle fibers prior to contraction causes a more forceful contraction.
B)   Increasing venous return increases EDV, which leads to an increased stroke volume.
C)   As cardiac output decreases, blood pools in the vasculature and increases arterial blood pressure.
D)   The left ventricle must pump more blood than the right ventricle since the left ventricle must pump blood to more regions of the body.
E)   The greater the stroke volume, the smaller the subsequent ESV, because as more blood is squeezed out, the heart cannot fill as completely.

Question 7

The pulmonary circulation carries oxygenated blood from the lungs through the coronary circulation and then into the aorta.

Accepted Answer

A) True 
 B)False

Question 8

Which valve(s)  prevent regurgitation of blood from a right ventricle to the atrium?

Accepted Answer

A)   tricuspid
B)   mitral
C)   pulmonary
D)   tricuspid and pulmonary
E)   all of these

Question 9

A whistling murmur heard between the second and first heart sound would be indicative of

Accepted Answer

A)   a stenotic AV valve
B)   an insufficient AV valve
C)   a myocardial infarction
D)   an insufficient semilunar valve
E)   No conclusions can be reached based on the information provided.

Question 10

If stroke volume is 80 ml and the heart rate is 70 beats per minute, the cardiac output is

Accepted Answer

A)   150 ml/min
B)   560 ml/min
C)   5,600 ml/min
D)   8,700 ml/min
E)   none of these

Question 11

The systemic circulation

Accepted Answer

A)   receives more blood than the pulmonary circulation does
B)   receives blood from the left ventricle
C)   is a low pressure system compared to the pulmonary circulation
D)   receives blood from the right ventricle and is a high pressure system compared to the pulmonary circulation
E)   receives more blood than the pulmonary circulation does, and receives blood from the left ventricle.

Question 12

One important function of the intrinsic control of the heart (Frank-Starling law of the heart) is to equalize the left and right cardiac outputs.

Accepted Answer

A) True 
 B)False

Question 13

Select the incorrect statement about rheumatic fever.

Accepted Answer

A)   It causes a heart murmur.
B)   It is an autoimmune disease.
C)   It is triggered by a streptococcus bacterium.
D)   The heart conduction system is disrupted.
E)   The heart valves become inflamed and scarred.

Question 14

Depolarization occurs at the AV node

Accepted Answer

A)   during the P wave
B)   between the P wave and QRS complex
C)   during the QRS complex
D)   between the QRS complex and T wave
E)   during the T wave

Question 15

The QRS complex represents

Accepted Answer

A)   depolarization of the atria
B)   depolarization of the ventricles
C)   the AV nodal delay
D)   repolarization of the ventricles
E)   the time during which the heart is contracting

Question 16

Parasympathetic innervation to the heart:

Accepted Answer

A)   involves the vagus nerve
B)   decreases the rate at which the pacemaker potential reaches threshold
C)   decreases the strength of ventricular contraction
D)   all of these
E)   involves the vagus nerve and decreases the strength of ventricular contraction

Question 17

A lumen that contains blood with a comparatively higher concentration of oxygen is in the

Accepted Answer

A)   right ventricle
B)   inferior vena cava
C)   pulmonary artery
D)   pulmonary vein
E)   coronary veins

Question 18

Complete each of the following statements with increases, decreases, or has no effect on.
An increase in parasympathetic activity ____________________ the stroke volume.

Accepted Answer

The answer of Complete each of the following statements with...

Question 19

The wall of the left ventricle is thicker than the wall of the right ventricle because the

Accepted Answer

A)   left ventricle must pump much more blood than the right ventricle so it must have stronger walls
B)   right ventricle must pump much more blood than the left ventricle so it has a larger chamber to accommodate the blood and a correspondingly thinner wall
C)   left ventricle must pump the same amount of blood into a higher-resistance, higher-pressure system
D)   right ventricle must create higher tension within its walls
E)   left ventricle must pump oxygenated blood, which requires more energy than pumping deoxygenated blood

Question 20

The aortic valve prevents backflow of blood from entering the left ventricle during ventricular diastole.

Accepted Answer

A) True 
 B)False

Exam 9: A--Cardiac Physiology

The pulmonary circulation carries oxygenated blood from the lungs through the coronary circulation and then into the aorta.

Correct AnswerverifiedShow Answer

One important function of the intrinsic control of the heart (Frank-Starling law of the heart) is to equalize the left and right cardiac outputs.

Correct AnswerverifiedShow Answer

According to the Frank-Starling law of the heart, the shorter the initial length of the cardiac muscle fibers prior to contraction, the more forceful will be the subsequent contraction because the fibers are already partially contracted.

Correct AnswerverifiedShow Answer

A whistling murmur heard between the second and first heart sound would be indicative of

Correct AnswerverifiedShow Answer

Norepinephrine increases calcium permeability in cardiac muscle cells and thus increases the heart's contractility.

Correct AnswerverifiedShow Answer

A lumen that contains blood with a comparatively higher concentration of oxygen is in the

Correct AnswerverifiedShow Answer

Complete each of the following statements with increases, decreases, or has no effect on. An increase in the length of the cardiac muscle fibers prior to contraction ____________________ the number of heart sounds heard.

Correct AnswerverifiedShow Answer

The QRS complex represents

Correct AnswerverifiedShow Answer

Which valve(s) prevent regurgitation of blood from a right ventricle to the atrium?

Correct AnswerverifiedShow Answer

Parasympathetic innervation to the heart:

Correct AnswerverifiedShow Answer

What percentage of ventricular filling is normally accomplished before atrial contraction begins?

Correct AnswerverifiedShow Answer

According to the Frank-Starling law of the heart,

Correct AnswerverifiedShow Answer

The wall of the left ventricle is thicker than the wall of the right ventricle because the

Correct AnswerverifiedShow Answer

Depolarization occurs at the AV node

Correct AnswerverifiedShow Answer

Complete each of the following statements with increases, decreases, or has no effect on. Becoming more physically fit ____________________ a person's cardiac reserve.

Correct AnswerverifiedShow Answer

Complete each of the following statements with increases, decreases, or has no effect on. An increase in parasympathetic activity ____________________ the stroke volume.

Correct AnswerverifiedShow Answer

The systemic circulation

Correct AnswerverifiedShow Answer

If stroke volume is 80 ml and the heart rate is 70 beats per minute, the cardiac output is

Correct AnswerverifiedShow Answer

Select the incorrect statement about rheumatic fever.

Correct AnswerverifiedShow Answer

The aortic valve prevents backflow of blood from entering the left ventricle during ventricular diastole.

Correct AnswerverifiedShow Answer

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