Question 1

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 2

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 3

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 4

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 5

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 6

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 7

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

Accepted Answer

A) True 
 B)False

Question 8

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 9

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 10

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 11

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 12

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 13

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

Accepted Answer

A) True 
 B)False

Question 14

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 15

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 16

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 17

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 18

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 19

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 20

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

Exam 9: A--Cardiac Physiology

According to the Frank-Starling law of the heart,

The systemic circulation

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

Parasympathetic innervation to the heart:

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

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.

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

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.

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

The QRS complex represents

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

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

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

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

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

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

Select the incorrect statement about rheumatic fever.

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

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.

Depolarization occurs at the AV node