Anatomy and Physiology Quizzes Online - Page 1

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اشترك في: الخميس إبريل 04, 2013 10:28 pm

Anatomy and Physiology Quizzes Online - Page 1

مشاركةبواسطة دكتور كمال سيد » الاثنين أكتوبر 26, 2015 9:53 pm

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مشاركات: 11470
اشترك في: الخميس إبريل 04, 2013 10:28 pm

Re: Anatomy and Physiology Quizzes Online - Page 1

مشاركةبواسطة دكتور كمال سيد » الثلاثاء نوفمبر 13, 2018 10:29 pm

Quick quiz
1.
The term
automaticity
refers to the ability of a cell to:
A. initiate an impulse on its own.
B. send impulses in all directions.
C. block impulses formed in areas other than the SA node.
D. generate an impulse when stimulated.
Answer:
A. Automaticity, the ability of a cell to initiate an im-
pulse on its own, is a unique characteristic of cardiac cells.
2.
Parasympathetic stimulation of the heart results in:
A. increased heart rate and decreased contractility.
B. increased heart rate and faster AV conduction.
C. decreased heart rate and slower AV conduction.
D. decreased heart rate and increased contractility.
Answer:
C. Parasympathetic stimulation of the vagus nerve
causes a decrease in heart rate and slowed AV conduction.
3.
The normal pacemaker of the heart is the:
A. SA node.
B. AV node.
C. bundle of His.
D. Purkinje fibers.
Answer:
A. The SA node is the normal pacemaker of the heart,
firing at an intrinsic rate of 60 to 100 times per minute.
4.
The impulse delay produced by the AV node allows the atria
to:
A. repolarize simultaneously.
B. contract before the ventricles.
C. send impulses to the bundle of His.
D. complete their filling.
Answer:
B. The 0.04-second delay allows the atria to contract
and the ventricles to completely fill, which optimizes cardiac out-
put.
5.
The coronary arteries fill with blood during:
A. atrial systole.
B. atrial diastole.
C. ventricular systole.
D. ventricular diastole.
Answer:
D. The coronary arteries fill with blood when the ven-
tricles are in diastole and filling with blood. The aortic valve is
closed at that time, so it no longer blocks blood flow through the
coronary ostium into the coronary arteries.
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CARDIAC ANATOMY AND PHYSIOLOGY
6.
When stimulated, baroreceptors cause the heart rate to:
A. increase.
B. decrease.
C. stay the same.
D. become irregular.
Answer:
B. Baroreceptors, when stimulated, cause the heart rate
to decrease.
7.
The two valves called the
semilunar valves
are the:
A. pulmonic and tricuspid valves.
B. pulmonic and aortic valves.
C. aortic and mitral valves.
D. aortic and tricuspid valves.
Answer:
B. The pulmonic and aortic valves are semilunar.
8.
Passive stretching exerted by blood on the ventricular
muscle at the end of diastole is referred to as:
A. preload.
B. afterload.
C. the atrial kick.
D. cardiac output.
Answer:
A. Preload is the passive stretching exerted by blood on
the ventricular muscle at the end of diastole. It increases with an
increase in venous return to the heart.
9.
A patient admitted with an acute MI has a heart rate of 36
beats/minute. Based on this finding, which area of the heart is
most likely serving as the pacemaker?
A. SA node
B. AV node
C. Bachmann’s bundle
D. Purkinje fibers
Answer:
D. If the SA node (which fires at a rate of 60 to 100 times
per minute) and the AV node (which takes over firing at 40 to 60
times per minute) are damaged, the Purkinje fibers take over fir-
ing at a rate of 20 to 40 times per minute.
Scoring
If you answered all nine questions correctly, hooray! You’re a hap-
penin’, heart-smart hipster.
If you answered six to eight questions correctly, way to go! You’re
clearly heart smart.
If you answered fewer than six questions correctly, take heart.
Just review this chapter and you’ll be up to speed.
✰✰✰
✰✰

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