Human Anatomy (9th Edition)
9th Edition
ISBN: 9780134320762
Author: Frederic H. Martini, Robert B. Tallitsch, Judi L. Nath
Publisher: PEARSON
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Question
Chapter 21, Problem 5RC
Summary Introduction
To review:
The reason for the absence of the muscular braces in the aortic and pulmonary valves.
Introduction:
The human heart has four valves present, namely aortic valve, pulmonary valve, tricuspid valve, and mitral valve. The mitral valve and tricuspid valve are atrioventricular (AV) valves.
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Chapter 21 Solutions
Human Anatomy (9th Edition)
Ch. 21 - Match each numbered item with the most closely...Ch. 21 - Prob. 2RFTCh. 21 - Prob. 3RFTCh. 21 - Prob. 4RFTCh. 21 - Prob. 5RFTCh. 21 - Match each numbered item with the most closely...Ch. 21 - Prob. 7RFTCh. 21 - Prob. 8RFTCh. 21 - Prob. 9RFTCh. 21 - Match each numbered item with the most closely...
Ch. 21 - The potential space between the parietal and...Ch. 21 - Prob. 12RFTCh. 21 - Which of the following is not true of intercalated...Ch. 21 - Prob. 14RFTCh. 21 - The pacemaker cells of the heart are located in...Ch. 21 - Prob. 16RFTCh. 21 - Prob. 1RCCh. 21 - If the papillary muscles fail to contract, (a)...Ch. 21 - Prob. 3RCCh. 21 - Prob. 4RCCh. 21 - Prob. 5RCCh. 21 - Define a pacemaker cell, and list the group of...Ch. 21 - Prob. 7RCCh. 21 - Prob. 8RCCh. 21 - Why are nodal cells unique? What is their...Ch. 21 - Prob. 10RCCh. 21 - Prob. 1CTCh. 21 - 2. Lee is brought to the emergency room suffering...Ch. 21 - Prob. 3CT
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- What structures and properties should an artificial heart have?arrow_forwardWhat are the difference between contractile cells of the heart and electrical cells responsible for generation and conduction of impulses. Why is the cardiac action potential propagated more slowly in an AV node cell than in an atrial or ventricular myocyte? How are the channels and ions that are responsible for depolarization and repolarization work? How can be AV conduction affected by hypokalemia?arrow_forwardThe left AV valve has only two large leaflets, while the right AV valve has three smaller leaflets. It is a general principle of physiology that structure is a determinant of—and has coevolved with—function. Although it is unknown why the two valves differ in structure in this way, what difference in the functional demands of the left side of the heart might explain why there is one less valve leaflet than on the right side?arrow_forward
- What anatomic features slow the conduction rate of the action potential as it passes through the AV node? What is the function of this delay?arrow_forwardHow would heart function be affected if the AV valves did not completely close during ventricular contraction?arrow_forwardWhat is the role of one-way valves in the return of blood to the heart?arrow_forward
- During isovolumetric ventricular contraction: a) all valves are open and pressure within the ventricles decreases. b) all valves are open and pressure within the ventricles increases. c) all valves are closed and pressure within the ventricles decreases. d) all valves are closed and pressure within the ventricles increases.arrow_forwardWhere are AV valves located within the heart? Where are semilunar valves located within the heart?arrow_forwardWhat exactly are av valves? What happens in the heart that causes them to open and close?arrow_forward
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