Ch. 18 The Cardiovascular System: The Heart
Chapter 17, Problem 19
a. Name the elements of the intrinsic conduction system of the heart in order, beginning with the pacemaker. b. What is the important function of this conduction system?
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Related Practice
Textbook Question
The activity of the heart depends on intrinsic properties of cardiac muscle and on neural factors. Thus,
a. vagus nerve stimulation of the heart reduces heart rate,
b. sympathetic nerve stimulation of the heart decreases time available for ventricular filling,
c. sympathetic stimulation of the heart increases its force of contraction,
d. all of the above.
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Textbook Question
Describe the pericardium and distinguish between the fibrous and the serous pericardia relative to histological structure and location.
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Textbook Question
a. Describe how heart contraction and relaxation influence coronary blood flow.
b. Name the major branches of the coronary arteries, and note the heart regions served by each.
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Textbook Question
Discuss how the Frank-Starling law of the heart helps to explain the influence of venous return on stroke volume.
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Textbook Question
You have been called upon to demonstrate the technique for listening to valve sounds.
a. Explain where you would position your stethoscope to auscultate (1) the aortic valve of a patient with severe aortic valve insufficiency and (2) a stenotic mitral valve.
b. During which period(s) would you hear these abnormal valve sounds most clearly? (During atrial diastole, ventricular systole, ventricular diastole, or atrial systole?)
c. What cues would you use to differentiate between an insufficient and a stenotic valve?
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