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Exam 22: Heart

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Question 21

True/False

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It is the contraction of the atria during atrial systole that completes the filling of the ventricles while the ventricles are in diastole.

A) True
B) False

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Question 22

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) All of the above
G) B) and D)

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Question 23

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It is during weeks 5-8 that the single heart tube of the embryo becomes partitioned into four chambers and the main vessels that leave and enter the heart form.

No matter the cause,hypertrophy of the heart causes it to work less efficiently.

Development of the heart commences in the _______ week.

Which are differences between cardiac muscle tissue and skeletal muscle tissue? A: The sarcoplasmic reticulum in cardiac muscle is less extensive. B: The sarcoplasmic reticulum in cardiac muscle is more organized. C: Cardiac muscle has intercalated discs;skeletal muscle does not. D: Cardiac muscle has 1 or 2 nuclei per cell;skeletal muscle has multiple nuclei per cell. E: Cardiac muscle has more well defined terminal cisternae.

Which prenatal structure forms the ascending aorta and pulmonary trunk?

Which heart chambers pump deoxygenated blood?

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

The cardiac cycle is

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

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

During a cardiac cycle,how many of the four chambers contract at any one time?

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.

Parasympathetic innervation decreases the heart rate,but generally tends to have no effect on the force of contractions.

Sympathetic innervation of the heart arises from the ________ segments of the spinal cord.

For ___________ of the cardiac cycle,all four chambers are in diastole together.

All cardiac veins eventually drain into the coronary sinus for return of the blood from the myocardium to the right atrium.

Which correctly describes the heart's apex?

Which carries oxygenated blood from the lungs to the heart?