MCDB 111 Su 2017 Thursday Section quiz 3 Key 8/24/17 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 one point. 1. The broad “plateau” that characterizes the action potential of a cardiac contractile cell is primarily due a. F-type Na+ channels b. T-type Ca2+channels c. Delayed rectifier K+channels d. Slow chloride channels e. L-type Ca2+channels 2. Cardiac output can be determined by a. multiplying pulse pressure by mean arterial pressure b. multiplying heart rate by stroke volume c. dividing mean arterial pressure by total peripheral resistance (TPR) d. both b and c e. all of the above 3. The primary function of the skeletal muscle pump is to assure that a. skeletal muscles receive an adequate blood flow b. the lungs expand to their maximum capacity so as to transfer adequate oxygen to the pulmonary veins c. adequate venous pressure is maintained to assure the return of blood to the heart d. the left ventricle contracts with sufficient force to maximize stroke volume e. capillaries, which lack smooth muscle, are able maintain sufficient pressure to transfer blood to venules 4. The actions of norepinephrine and epinephrine on cardiac myocytes are carried out through activation of a. protein kinase A (PKA) b. myosin light chain kinase c. nitric oxide synthase d. protein kinase C (PKC) e. myosin light chain phosphatase 5. A capillary has an internal hydrostatic pressure of 15 mm Hg and an internal osmotic force of 10 mm Hg, The interstitial fluid osmotic force is 5 mm Hg and the interstitial fluid hydrostatic pressure is 10 mm Hg. What is the net filtration pressure? a. 15 mmHg b. -15 mm Hg c. 0 mm Hg d. 10 mm Hg e. 40 mm Hg Net filtration pressure = Pc + IF –PIF - c = 15 + 5 – 10 -10 =
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