Pathophysiology > EXAM > Structure and Function of the Cardiovascular and Lymphatic Systems Huether & McCance: Understanding (All)

Structure and Function of the Cardiovascular and Lymphatic Systems Huether & McCance: Understanding Pathophysiology, 6th Edition MULTIPLE CHOICE

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MULTIPLE CHOICE 1. The pericardium is: a. the outer muscular layer of the heart. b. the innermost layer of the heart chambers. c. a membranous sac that encloses the heart. d. the heart’s fibrou... s skeleton. ANS: C The pericardium is the membranous sac that surrounds the heart. The outer layer that acts as the fibrous skeleton of the heart is the myocardium. The innermost layer of the heart is the endocardium. REF: p. 570 2. A function of the pericardium is to: a. provide a barrier against extracardial infections. b. improve blood flow through the heart. c. play a role in cardiac conduction. d. assist in cardiac contraction. ANS: A A function of the pericardium is to provide a barrier against extracardial infections. The pericardium does not improve blood flow through the heart as it is on the outside. The inner portions of the heart control cardiac conduction. The muscular layers assist with cardiac contraction. REF: p. 570 3. As a result of blockage in the pulmonary artery, blood would first back up into the: a. aorta. b. left ventricle. c. pulmonary veins. d. right ventricle. ANS: D Blockage in the pulmonary artery would cause blood to back up into the right ventricle, not the aorta since these two vessels do not communicate. The pulmonary artery and left ventricle do not communicate. Blockage in the pulmonary artery would not cause blood to back up into the pulmonary vein since the pulmonary vein takes blood to the left atrium [Show More]

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