Question 1

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 2

Although not seen on an ECG, the period of isovolumetric contraction would occur nearest which deflection of an ECG?

Accepted Answer

The answer of Although not seen on an ECG, the...

Question 3

The refractory period in cardiac muscle is much shorter than the refractory period in skeletal muscle to ensure that the heart can quickly be re-stimulated to produce alternate periods of contraction and relaxation.

Accepted Answer

A) True 
 B)False

Question 4

Match heart characteristic with correct anatomical structure.
a.tricuspid valve
b.myocardium
c.aortic semilunar valve
d.AV node
e.sinoatrial node
-Contraction of this generates blood pressure

Accepted Answer

The answer of Match heart characteristic with correct anatomical structure.
a.tricuspid...

Question 5

Use the following answer code to compare the magnitude of the items in question.
a.A is greater than b.b.B is greater than a.c.A and B are equal or nearly equal.
-a.Volume of blood in the left ventricle when the aortic valve opens
B.Volume of blood in the left ventricle when the aortic valve closes

Accepted Answer

The answer of Use the following answer code to compare...

Question 6

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 7

Increased EDV results in decreased stroke volume, and increased stroke volume results in increased ESV.

Accepted Answer

A) True 
 B)False

Question 8

Use the following answer code to compare the magnitude of the items in question.
a.A is greater than b.b.B is greater than a.c.A and B are equal or nearly equal.
-a.Volume of blood in the ventricles at the onset of isovolumetric ventricular contraction
B.Volume of blood in the ventricles at the end of isovolumetric ventricular contraction

Accepted Answer

The answer of Use the following answer code to compare...

Question 9

Use this figure to answer the corresponding questions.
-This graph shows the electrical activity for one of the heart's
a.contractile cells
b.pacemaker cells
c.autorhythmic cells
d.contractile and autorhythmic cells
e.pacemaker and autorhythmic cells

Accepted Answer

The answer of  
Use this figure to answer the...

Question 10

The direction of impulses through the conduction system of the heart is normally

Accepted Answer

A) AV node-SA node-bundle of His-Purkinje fibers 
B) AV node-bundle of His-SA node--Purkinje fibers 
C) bundle of His-AV node-Purkinje fibers-SA node 
D) SA node-AV node-bundle of His-Purkinje fibers 
E) SA node-bundle of His-Purkinje fibers-AV node

Question 11

Contraction of the spirally arranged cardiac muscle fibers produces a wringing effect for efficient pumping.

Accepted Answer

A) True 
 B)False

Question 12

The electrocardiogram is most useful in determining which component of cardiac output?

Accepted Answer

A) stroke volume 
B) heart rate 
C) ejection fraction 
D) end-diastolic volume 
E) murmurs

Question 13

L-type calcium channels allow the refractory periods in the heart's contractile cells to be about as long as the cells' relaxation periods.

Accepted Answer

A) True 
 B)False

Question 14

The function of the ventricular conduction system of the heart is to

Accepted Answer

A) spread the action potential throughout the ventricle to ensure a single, coordinated contraction of the both ventricles 
B) spread the action potential in the absence of sympathetic stimulation 
C) spread the action potential throughout the atria and ventricles 
D) slow down the original action potential so it has time to spread through the ventricles evenly 
E) perform both a and d

Question 15

Indicate which valve abnormality is being described using the answer code below.
a.valvular stenosis
b.valvular insufficiency
-Produces a "gurgling" murmur

Accepted Answer

The answer of Indicate which valve abnormality is being described...

Question 16

A(n) ____________________ is a clot attached to the wall of a vessel.

Accepted Answer

The answer of A(n) ____________________ is a clot attached to...

Question 17

During heart failure,

Accepted Answer

A) the Frank-Starling curve shifts to the left 
B) the heart pumps out a smaller stroke volume than normal for a given EDV 
C) a compensatory increase in sympathetic activity increases the contractility of the heart to normal in the early stages of the disease 
D) both a and c occur 
E) both b and c occur

Question 18

Which of the following criteria must be met for the heart to function efficiently?

Accepted Answer

A) Excitation and contraction of each heart chamber should be coordinated to ensure efficient pumping. 
B) The atria should be excited and contract before the onset of ventricular contraction to ensure that ventricular filling is complete. 
C) The right side of the heart should contract first to ensure that oxygenated blood is delivered to the heart before the left side contracts. 
D) Both a and b 
E) Both b and c

Question 19

The AV valve controls the amount of blood entering the atrium from the venous system.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following is not associated with an increase in stroke volume?

Accepted Answer

A) increased end-diastolic volume 
B) increased contractility of the heart 
C) increased end-systolic volume 
D) increased preload 
E) increased venous return

Exam 9: Cardiac Physiology

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.

Although not seen on an ECG, the period of isovolumetric contraction would occur nearest which deflection of an ECG?

The refractory period in cardiac muscle is much shorter than the refractory period in skeletal muscle to ensure that the heart can quickly be re-stimulated to produce alternate periods of contraction and relaxation.

Match heart characteristic with correct anatomical structure. a.tricuspid valve b.myocardium c.aortic semilunar valve d.AV node e.sinoatrial node -Contraction of this generates blood pressure

Use the following answer code to compare the magnitude of the items in question. a.A is greater than b.b.B is greater than a.c.A and B are equal or nearly equal. -a.Volume of blood in the left ventricle when the aortic valve opens B.Volume of blood in the left ventricle when the aortic valve closes

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

Increased EDV results in decreased stroke volume, and increased stroke volume results in increased ESV.

Use this figure to answer the corresponding questions. -This graph shows the electrical activity for one of the heart's a.contractile cells b.pacemaker cells c.autorhythmic cells d.contractile and autorhythmic cells e.pacemaker and autorhythmic cells

The direction of impulses through the conduction system of the heart is normally

Contraction of the spirally arranged cardiac muscle fibers produces a wringing effect for efficient pumping.

The electrocardiogram is most useful in determining which component of cardiac output?

L-type calcium channels allow the refractory periods in the heart's contractile cells to be about as long as the cells' relaxation periods.

The function of the ventricular conduction system of the heart is to

Indicate which valve abnormality is being described using the answer code below. a.valvular stenosis b.valvular insufficiency -Produces a "gurgling" murmur

A(n) ____________________ is a clot attached to the wall of a vessel.

During heart failure,

Which of the following criteria must be met for the heart to function efficiently?

The AV valve controls the amount of blood entering the atrium from the venous system.

Which of the following is not associated with an increase in stroke volume?