MCDB 111 Su 2017 Wed Section quiz 3 8/23/17 Answer each question on your scantron form. Make sure your name, perm, and MCDB 111 Summer quiz 3 appears on the answer form. Each correct answer is worth 1 point. 1. Sympathetic stimulation of the heart a. increases the rate of force developed during cardiac muscle contraction b. increases stroke volume c. increases the rate of cardiac muscle contraction d. increases the rate of cardiac muscle relaxation e. all of the above 2. The lack of a stable resting potential in cardiac pacemaker cells is due to a. F-type Na+ channels b. T-type Ca2+channels c. Delayed rectifier K+channels d. Fast chloride channels e. L-type Ca2+channels 3. Which of the following describes the path of blood flow through the circulatory system? (lf = left, rt = right) a. lf atrium, lf ventricle, pulmonary artery, lungs, pulmonary vein, rt atrium, rt ventricle, body b. pulmonary artery, lungs, pulmonary vein, rt atrium, rt ventricle, lf atrium, lf ventricle, body c. body, lf atrium, lf ventricle, pulmonary vein, rt atrium, rt ventricle, pulmonary artery, lungs d. rt atrium, rt ventricle, pulmonary artery, lungs, pulmonary vein, lf atrium, lf ventricle, body e. None of these is correct 4. Sympathetic stimulation of the heart a. decreases the stroke volume b. increases the rate of heart contraction c. decreases the force of heart contraction d. decreases the rate of rate of relaxation of cardiac myocytes - e. b and c 5. Which type of cardiac malfunction would be consistent with a smaller than normal ECG “t wave” ? a. A problem involving atrial contraction b. A problem involving atrial relaxation c. A problem involving ventricular contraction d. A problem involving ventricular relaxation c. A problem involving the SA
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