Question 1

Once an SA nodal cell reaches threshold, the depolarization phase occurs during which

Accepted Answer

A)   potassium comes in through fast voltage-gated channels.
B)   calcium comes in through fast voltage-gated channels.
C)   potassium moves out through fast voltage-gated channels.
D)   sodium moves out through slow voltage-gated channels.
E)   calcium moves out through slow voltage-gated channels.F) A) and B)
G) A) and D)

Question 2

A drug that decreased calcium levels in a muscle cell and thereby lowered the number of crossbridges formed during the heart's contractions would be a

Accepted Answer

A)   positive chronotropic agent.
B)   negative chronotropic agent.
C)   positive inotropic agent.
D)   negative inotropic agent.E) All of the above
F) A) and C)

Question 3

The anterior part of each atrium is a flaplike extension called a(n) ________.

Accepted Answer

The answer of The anterior part of each atrium is...

Question 4

The shutting of the semilunar valves occurs during which phase?

Accepted Answer

A)   Isovolumetric contraction
B)   Ventricular ejection
C)   Isovolumetric relaxation
D)   Atrial contraction and ventricular filling
E)   Late ventricular diastoleF) None of the above
G) D) and E)

Question 5

The term "epicardium" is another name for the

Accepted Answer

A)   visceral layer of the serosal pericardium.
B)   parietal layer of the serosal pericardium.
C)   external layer of the fibrous pericardium.
D)   myocardium.
E)   mediastinum.F) B) and D)
G) A) and E)

Question 6

As with action potentials in other types of cells, the repolarization of cardiac muscle cells involves the

Accepted Answer

A)   entrance of calcium through voltage-gated channels.
B)   exit of potassium through voltage-gated channels.
C)   entrance of sodium through voltage-gated channels.
D)   binding of ACh to ACh receptor.
E)   simultaneous closure of sodium channels and opening of calcium channels.F) A) and B)
G) A) and C)

Question 7

Someone with tachyarrhythmia would be expected to show an abnormally

Accepted Answer

A)   small Q-T interval.
B)   large P-R interval.
C)   large R-R interval.
D)   high amplitude P wave.E) A) and B)
F) A) and C)

Question 8

The pulmonary trunk receives blood from the right ventricle and conducts it toward the lung. The pulmonary trunk is a(n)

Accepted Answer

A)   artery.
B)   capillary.
C)   vein.D) A) and B)
E) None of the above

Question 9

The atrial reflex relies upon chemoreceptors to detect stretch in the atrial wall.

Accepted Answer

A) True 
 B)False

Question 10

All of the heart's sulci house blood vessels that supply the myocardium.

Accepted Answer

A) True 
 B)False

Question 11

Most of the calcium that triggers contraction of cardiac muscle comes

Accepted Answer

A)   into the cell through leakage channels in the sarcolemma.
B)   into the cell through voltage-gated channels in the sarcolemma.
C)   from the sarcoplasmic reticulum of the cell.
D)   from the Golgi apparatus of the cell.E) C) and D)
F) A) and D)

Question 12

Which can be used to characterize blood flow in the human body?
A: There is a unidirectional blood flow.
B: Arteries always carry oxygenated blood.
C: Veins always carry deoxygenated blood.
D: Arteries carry blood away from the heart.
E: Veins carry blood toward the heart.

Accepted Answer

A)   a, c, d, e
B)   a, b, c, d, e
C)   a, d, e
D)   b, c, d, e
E)   d, eF) A) and B)
G) A) and C)

Question 13

An autorhythmic heart cell is one in which

Accepted Answer

A)   action potentials fire spontaneously.
B)   action potentials are stimulated by internal stores of acetylcholine.
C)   action potentials always occur at exactly the same frequency.
D)   all filaments contract and relax with a high degree of synchrony.
E)   action potentials are initiated by the autonomic nervous system.F) A) and E)
G) A) and D)

Question 14

The atria are separated from the ventricles externally by the

Accepted Answer

A)   anterior interventricular sulcus.
B)   posterior interventricular sulcus.
C)   sinoventricular sulcus.
D)   coronary sulcus.
E)   None of the choices is correct.F) C) and E)
G) B) and C)

Question 15

Immediately prior to atrial contraction, blood continues to enter the atria from the venae cavae and pulmonary veins.

Accepted Answer

A) True 
 B)False

Question 16

Blood moves into and then out of a heart chamber because

Accepted Answer

A)   it moves along its pressure gradient, and that gradient depends on contraction and relaxation during the cardiac cycle.
B)   it is under constant pressure, but its movement is dictated by the control of valve openings and closures.
C)   the veins and arteries constrict and dilate to propel and attract blood.
D)   All of the choices are correct.E) C) and D)
F) B) and C)

Question 17

Around day 21 of development the primitive heart begins to beat. At this stage it contains the four chambers: two atria and two ventricles.

Accepted Answer

A) True 
 B)False

Question 18

The opening and closing of the heart valves is caused by

Accepted Answer

A)   contraction and relaxation of papillary muscles that pull on heart strings.
B)   pressure changes of alternating contraction and relaxation during the cardiac cycle.
C)   contraction of the smooth muscle in the walls of the great vessels leaving the heart.
D)   action potentials within the cusps of the valves.E) A) and B)
F) None of the above

Question 19

The inferior chambers of the heart are called ________.

Accepted Answer

The answer of The inferior chambers of the heart are...

Question 20

In an EKG, the P wave is generated when the

Accepted Answer

A)   ventricles depolarize.
B)   atria depolarize.
C)   atria repolarize.
D)   ventricles repolarize.
E)   Purkinje fibers initiate an impulse.F) All of the above
G) A) and B)

Exam 19: Cardiovascular System: Heart

The shutting of the semilunar valves occurs during which phase?

Correct AnswerverifiedShow Answer

Blood moves into and then out of a heart chamber because

Correct AnswerverifiedShow Answer

Someone with tachyarrhythmia would be expected to show an abnormally

Correct AnswerverifiedShow Answer

Immediately prior to atrial contraction, blood continues to enter the atria from the venae cavae and pulmonary veins.

Correct AnswerverifiedShow Answer

The opening and closing of the heart valves is caused by

Correct AnswerverifiedShow Answer

The pulmonary trunk receives blood from the right ventricle and conducts it toward the lung. The pulmonary trunk is a(n)

Correct AnswerverifiedShow Answer

Most of the calcium that triggers contraction of cardiac muscle comes

Correct AnswerverifiedShow Answer

As with action potentials in other types of cells, the repolarization of cardiac muscle cells involves the

Correct AnswerverifiedShow Answer

Once an SA nodal cell reaches threshold, the depolarization phase occurs during which

Correct AnswerverifiedShow Answer

In an EKG, the P wave is generated when the

Correct AnswerverifiedShow Answer

All of the heart's sulci house blood vessels that supply the myocardium.

Correct AnswerverifiedShow Answer

Which can be used to characterize blood flow in the human body? A: There is a unidirectional blood flow. B: Arteries always carry oxygenated blood. C: Veins always carry deoxygenated blood. D: Arteries carry blood away from the heart. E: Veins carry blood toward the heart.

Correct AnswerverifiedShow Answer

The term "epicardium" is another name for the

Correct AnswerverifiedShow Answer

The anterior part of each atrium is a flaplike extension called a(n) ________.

Correct AnswerverifiedShow Answer

The atria are separated from the ventricles externally by the

Correct AnswerverifiedShow Answer

Around day 21 of development the primitive heart begins to beat. At this stage it contains the four chambers: two atria and two ventricles.

Correct AnswerverifiedShow Answer

The inferior chambers of the heart are called ________.

Correct AnswerverifiedShow Answer

A drug that decreased calcium levels in a muscle cell and thereby lowered the number of crossbridges formed during the heart's contractions would be a

Correct AnswerverifiedShow Answer

The atrial reflex relies upon chemoreceptors to detect stretch in the atrial wall.

Correct AnswerverifiedShow Answer

An autorhythmic heart cell is one in which

Correct AnswerverifiedShow Answer

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