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Exam 22: Heart

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Question 31

Multiple Choice

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Of the four "normal" heart sounds,the initial "lubb" sound is heard when the

A) AV valves close.
B) semilunar valves close.
C) AV valves open.
D) semilunar valves open.
E) foramen ovale closes.

F) None of the above
G) C) and D)

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Question 32

Multiple Choice

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One example of cardiac arrhythmia is _________,in which a rapid,repetitious movement of the ventricular muscle replaces normal contractions.

A) atrial fibrillation
B) atrial flutter
C) ventricular fibrillation
D) premature ventricular contraction
E) None of the choices is correct.

F) A) and B)
G) All of the above

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Question 33

Multiple Choice

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The beginning of the cardiac cycle is when the

The internal wall surface of each ventricle displays large,smooth,irregular muscular ridges called

One reason that necessitates the relatively early development of the heart is that the embryo has become too large to receive adequate nutrient supply by diffusion alone.

Sympathetic innervation of the heart A: increases the heart rate. B: decreases the heart rate. C: increases the force of contractions. D: decreases the force of contractions. E: has no effect on contraction force.

Which analogy fits the human heart?

The embryonic heart actually begins working before its development is complete.

It is the _____________ that permits the compression necessary to pump large volumes of blood out of the ventricles.

The epicardium is another name for the

The numerous ________________ within the intercalated discs prevent cardiac muscle fibers from pulling apart.

The relaxation phase of a heart chamber is termed ________________.

Which are functions performed by the fibrous skeleton of the heart? A: Separates the atria and ventricles B: Anchors the heart valves C: Provides electrical insulation between the atria and ventricles D: Provides the framework for the attachment of the myocardium E: None of these are true functions of the fibrous skeleton of the heart.

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

The gap junctions of intercalated discs provide a low-resistance pathway across the membranes of adjoining cardiac muscle fibers.

The ______________ circuit consists of the chambers on the right side of the heart as well as the pulmonary arteries and veins.

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.

The _______________ cardiac vein travels alongside the right marginal artery.

The arteries and veins that leave and enter the heart are called the great vessels because

The left ventricle has a wall that is typically three times thicker than the right ventricular wall.