Question 1

The time that starts when a muscle cell is depolarized and ends when it is able to be restimulated is the ________ period.

Accepted Answer

The answer of The time that starts when a muscle...

Question 2

During the plateau phase of a cardiac muscle cell's action potential, the membrane stays

Accepted Answer

A)   depolarized as potassium exits and calcium enters.
B)   depolarized as potassium enters and calcium exits.
C)   repolarized as sodium enters and calcium exits.
D)   hyperpolarized as sodium and calcium exit.
E)   hyperpolarized as potassium enters and calcium exits.F) B) and C)
G) A) and E)

Question 3

Like skeletal muscle cells, cardiac muscle cells have an absolute refractory period prior to repolarization.

Accepted Answer

A) True 
 B)False

Question 4

The posterior interventricular sulcus

Accepted Answer

A)   is another name for the coronary sulcus.
B)   contains the great cardiac vein and coronary sinus.
C)   is a groove between the ventricles on the back of the heart.
D)   is a valve in the interventricular septum that closes at birth.E) A) and B)
F) A) and C)

Question 5

The property that allows the heart to initiate each heartbeat itself is called ________.

Accepted Answer

The answer of The property that allows the heart to...

Question 6

The membrane of a contractile cardiac muscle cell contains

Accepted Answer

A)   fast voltage-gated sodium channels and fast voltage-gated calcium channels.
B)   fast voltage-gated sodium channels and slow voltage-gated calcium channels.
C)   slow voltage-gated sodium channels and slow voltage-gated calcium channels.
D)   slow voltage-gated sodium channels and fast voltage-gated calcium channels.E) B) and C)
F) None of the above

Question 7

The fossa ovalis appears just above the opening of the coronary sinus within the

Accepted Answer

A)   left atrium.
B)   left ventricle.
C)   right atrium.
D)   right ventricle.E) A) and C)
F) A) and D)

Question 8

Which feature permits the compression necessary to pump large volumes of blood out of the ventricles?

Accepted Answer

A)   Negative pressure inside the ventricles
B)   Absence of oxygenated blood in the atria
C)   Arrangement of cardiac muscle in the heart wall
D)   Presence of skeletal muscle tissue in the heart skeleton
E)   Presence of papillary muscles in the ventriclesF) D) and E)
G) None of the above

Question 9

Which carries oxygenated blood from the lungs to the heart?

Accepted Answer

A)   Pulmonary arteries
B)   Pulmonary veins
C)   Pulmonary trunk
D)   Inferior vena cava
E)   Superior vena cavaF) A) and B)
G) A) and C)

Question 10

The tetralogy of Fallot is

Accepted Answer

A)   a condition in which the left and right sides of the heart are completely reversed.
B)   a developmental disorder that is a cardiac septal defect.
C)   an exceptionally fast heart rate.
D)   an inadequate cardiac output due to poorly contracting heart chambers.
E)   occlusion of the left coronary artery.F) B) and C)
G) A) and D)

Question 11

Which action leads to the closure of the right atrioventricular valve?

Accepted Answer

A)   Contraction of the right atrium
B)   Contraction of the left atrium
C)   Contraction of the right ventricle
D)   Relaxation of the right ventricle
E)   Relaxation of the left atriumF) B) and E)
G) A) and B)

Question 12

Norepinephrine is considered a positive chronotropic agent because it causes

Accepted Answer

A)   less calcium to enter heart cells, which leads to lower risk of heart attack.
B)   more forceful contractions during each heart rate.
C)   an increase in the firing rate of SA node cells.
D)   thyroid hormone to have a steadying effect on heart activity.
E)   heart cell membrane potentials to become more positive during action potentials.F) A) and B)
G) A) and E)

Question 13

The connections shared by arteries that allow them to shunt blood from one artery to another are called ________.

Accepted Answer

The answer of The connections shared by arteries that allow...

Question 14

Atrial contraction occurs just before

Accepted Answer

A)   isovolumetric relaxation.
B)   atrial relaxation and ventricular filling.
C)   ventricular ejection.
D)   isovolumetric contraction.E) None of the above
F) B) and C)

Question 15

The middle layer of the heart wall that is made of cardiac muscle tissue is the ________.

Accepted Answer

The answer of The middle layer of the heart wall...

Question 16

In an ECG, what does the T wave represent?

Accepted Answer

A)   Depolarization of the atria
B)   Depolarization of the right ventricle
C)   Repolarization of the ventricles
D)   Closure of the AV valves
E)   Depolarization of the left ventricleF) A) and E)
G) A) and D)

Question 17

The heartbeat is initiated by the cells of the ________ node.

Accepted Answer

The answer of The heartbeat is initiated by the cells...

Question 18

Occlusion of blood vessels tends to lead to

Accepted Answer

A)   increases in perfusion.
B)   increases in capillary exchange.
C)   inadequate blood supply and damage to body tissues.
D)   defibrillation of cardiac muscle cell contraction.E) A) and C)
F) B) and C)

Question 19

The beginning of ventricular contraction, when all four valves are closed, is called (2 words) ________.

Accepted Answer

isovolumet...

Question 20

Someone with a heart block would have

Accepted Answer

A)   a long P-R interval.
B)   a long T-P interval.
C)   a short P-R interval.
D)   a short T-P interval.E) None of the above
F) A) and B)

Exam 19: Cardiovascular System: Heart

Which action leads to the closure of the right atrioventricular valve?

Correct AnswerverifiedShow Answer

The fossa ovalis appears just above the opening of the coronary sinus within the

Correct AnswerverifiedShow Answer

The membrane of a contractile cardiac muscle cell contains

Correct AnswerverifiedShow Answer

The time that starts when a muscle cell is depolarized and ends when it is able to be restimulated is the ________ period.

Correct AnswerverifiedShow Answer

In an ECG, what does the T wave represent?

Correct AnswerverifiedShow Answer

Norepinephrine is considered a positive chronotropic agent because it causes

Correct AnswerverifiedShow Answer

Occlusion of blood vessels tends to lead to

Correct AnswerverifiedShow Answer

The middle layer of the heart wall that is made of cardiac muscle tissue is the ________.

Correct AnswerverifiedShow Answer

The heartbeat is initiated by the cells of the ________ node.

Correct AnswerverifiedShow Answer

The beginning of ventricular contraction, when all four valves are closed, is called (2 words) ________.

Correct Answerverifiedisovolumet...View AnswerShow Answer

The posterior interventricular sulcus

Correct AnswerverifiedShow Answer

Someone with a heart block would have

Correct AnswerverifiedShow Answer

Which feature permits the compression necessary to pump large volumes of blood out of the ventricles?

Correct AnswerverifiedShow Answer

Which carries oxygenated blood from the lungs to the heart?

Correct AnswerverifiedShow Answer

Like skeletal muscle cells, cardiac muscle cells have an absolute refractory period prior to repolarization.

Correct AnswerverifiedShow Answer

During the plateau phase of a cardiac muscle cell's action potential, the membrane stays

Correct AnswerverifiedShow Answer

The tetralogy of Fallot is

Correct AnswerverifiedShow Answer

The connections shared by arteries that allow them to shunt blood from one artery to another are called ________.

Correct AnswerverifiedShow Answer

Atrial contraction occurs just before

Correct AnswerverifiedShow Answer

The property that allows the heart to initiate each heartbeat itself is called ________.

Correct AnswerverifiedShow Answer

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isovolumet...
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