Question 1

During the S-T segment, what is occurring within cardiac muscle cells?

Accepted Answer

A)   Sodium is rapidly diffusing out of atrial muscle cells.
B)   Sodium channels are beginning to open in ventricular cells and calcium is entering through slow channels in atrial cells.
C)   Calcium is entering and potassium is leaving ventricular cells.
D)   Potassium is entering atrial cells and sodium is leaving ventricular cells.E) All of the above
F) A) and B)

Question 2

What is the sequence of events in the transmission of an impulse through the heart muscle?
A: AV node
B: AV bundle
C: SA node
D: Through the atria
E: Through the ventricles
F: Bundle branches
G: Purkinje fibers

Accepted Answer

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

Question 3

Coronary vessels are open when the heart is

Accepted Answer

A)   contracting.
B)   relaxed.C) A) and B)
D) undefined

Question 4

Normally, the left and right ventricles eject the same amount of blood.

Accepted Answer

A) True 
 B)False

Question 5

SA nodal cells are autorhythmic.

Accepted Answer

A) True 
 B)False

Question 6

Which of the cardiovascular system's circuits has deoxygenated blood in its arteries?

Accepted Answer

A)   Pulmonary circuit
B)   Visceral circuit
C)   Coronary circuit
D)   Systemic circuitE) None of the above
F) A) and C)

Question 7

The ________ cardiac vein travels alongside the right marginal artery.

Accepted Answer

The answer of The ________ cardiac vein travels alongside the...

Question 8

Just prior to atrial contraction,

Accepted Answer

A)   all four chambers are at rest and AV valves are open.
B)   all four chambers are at rest and AV valves are closed.
C)   all four chambers are contracting and all valves are open.
D)   both ventricles are contracting and blood is being ejected into the major arteries.
E)   both atria are contracting and blood is being ejected into the major arteries.F) A) and B)
G) A) and C)

Question 9

As blood is pumped out of the heart and into the major arteries leaving the heart, it

Accepted Answer

A)   pushes against the semilunar valves and opens them.
B)   pushes against the semilunar valves and closes them.
C)   fills the cusps of the semilunar valves, causing them to expand and block the backflow of blood
D)   pushes against the atrioventricular valves and opens them.
E)   fills the cusps of the atrioventricular valve causing opening of the bicuspid and closure of the tricuspid.F) B) and E)
G) All of the above

Question 10

The layer of the heart wall composed of cardiac muscle tissue is the

Accepted Answer

A)   pericardium.
B)   myocardium.
C)   endocardium.
D)   pericardial cavity.
E)   pectinate muscle.F) D) and E)
G) A) and E)

Question 11

This artery is sometimes referred to as the "widowmaker" because blockage of it often leads to fatal heart attack. It serves the anterior heart and is more formally called the (2 or 3 words) ________ artery.

Accepted Answer

anterior interventri...

Question 12

The membrane of a contractile cardiac muscle cell contains

Accepted Answer

A)   no calcium pumps.
B)   calcium pumps that move calcium out of the cell.
C)   calcium pumps that move calcium into the cell.
D)   calcium pumps that open and allow calcium to diffuse down its concentration gradient to reach equilibrium.E) B) and D)
F) A) and C)

Question 13

Which layer is made of dense irregular connective tissue?

Accepted Answer

A)   Myocardium
B)   Fibrous pericardium
C)   Epicardium
D)   Serous pericardium
E)   EndocardiumF) None of the above
G) A) and D)

Question 14

Parasympathetic innervation of the heart occurs via

Accepted Answer

A)   CN IV.
B)   CN VI.
C)   CN VIII.
D)   CN X.
E)   CN XII.F) A) and E)
G) B) and E)

Question 15

The left ventricle walls are typically thicker than the right ventricular wall.

Accepted Answer

A) True 
 B)False

Question 16

Purkinje fibers are small fibers within the atria that conduct impulses rapidly.

Accepted Answer

A) True 
 B)False

Question 17

Which type of muscle cell exhibits a longer refractory period?

Accepted Answer

A)   Cardiac muscle cell
B)   Skeletal muscle cellC) A) and B)
D) undefined

Question 18

The foramen ovale of the fetal heart is an opening in the

Accepted Answer

A)   interventricular septum.
B)   interatrial septum.
C)   fossa ovalis.
D)   aorticopulmonary septum.
E)   tetralogy of Fallot.F) A) and D)
G) B) and C)

Question 19

During ventricular contraction, the semilunar valves close in order to permit the blood to enter the large arterial trunks that carry blood away from the heart.

Accepted Answer

A) True 
 B)False

Question 20

The great cardiac vein runs alongside the

Accepted Answer

A)   anterior interventricular artery.
B)   posterior interventricular artery.
C)   right marginal artery.
D)   aorta.
E)   coronary sinus.F) A) and D)
G) C) and D)

Exam 19: Cardiovascular System: Heart

Which layer is made of dense irregular connective tissue?

Correct AnswerverifiedShow Answer

The membrane of a contractile cardiac muscle cell contains

Correct AnswerverifiedShow Answer

The layer of the heart wall composed of cardiac muscle tissue is the

Correct AnswerverifiedShow Answer

Normally, the left and right ventricles eject the same amount of blood.

Correct AnswerverifiedShow Answer

As blood is pumped out of the heart and into the major arteries leaving the heart, it

Correct AnswerverifiedShow Answer

During ventricular contraction, the semilunar valves close in order to permit the blood to enter the large arterial trunks that carry blood away from the heart.

Correct AnswerverifiedShow Answer

Which type of muscle cell exhibits a longer refractory period?

Correct AnswerverifiedShow Answer

Purkinje fibers are small fibers within the atria that conduct impulses rapidly.

Correct AnswerverifiedShow Answer

The ________ cardiac vein travels alongside the right marginal artery.

Correct AnswerverifiedShow Answer

What is the sequence of events in the transmission of an impulse through the heart muscle? A: AV node B: AV bundle C: SA node D: Through the atria E: Through the ventricles F: Bundle branches G: Purkinje fibers

Correct AnswerverifiedShow Answer

During the S-T segment, what is occurring within cardiac muscle cells?

Correct AnswerverifiedShow Answer

The left ventricle walls are typically thicker than the right ventricular wall.

Correct AnswerverifiedShow Answer

This artery is sometimes referred to as the "widowmaker" because blockage of it often leads to fatal heart attack. It serves the anterior heart and is more formally called the (2 or 3 words) ________ artery.

Correct Answerverifiedanterior interventri...View AnswerShow Answer

Parasympathetic innervation of the heart occurs via

Correct AnswerverifiedShow Answer

SA nodal cells are autorhythmic.

Correct AnswerverifiedShow Answer

The great cardiac vein runs alongside the

Correct AnswerverifiedShow Answer

Which of the cardiovascular system's circuits has deoxygenated blood in its arteries?

Correct AnswerverifiedShow Answer

The foramen ovale of the fetal heart is an opening in the

Correct AnswerverifiedShow Answer

Coronary vessels are open when the heart is

Correct AnswerverifiedShow Answer

Just prior to atrial contraction,

Correct AnswerverifiedShow Answer

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anterior interventri...
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