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7. A client with a cardiovascular disorder has an order for an electronic pacemaker. The nurse knows that the electronic pacemaker is used for which condition? a. Lipid accumulation b. Poor functioning of the SA node c. Increased incidence of heart block d. Calcification of vessel walls 8. Why is an older adult at an increased risk for heart blocks? a. Lipid accumulation b. Decreased number of pacemaker cells in the SA node c. Calcification of vessel walls d. Decreased fibers in the bundle of His 9. Which is an accurate description of the endocardium? a. Thick strong muscles making up the mid- dle layer b. The thin outer layer of the cardiac wall c. A membrane lining the heart's interior wall e d. The outermost layer anchoring the heart 10. Which is the thickest of the four chambers of the heart? a. Left ventricle a- b. Right ventricle c. Left atrium d. Right atrium