human physiology study questions 22

human physiology study questions 22 - a) they have a...

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Lecture 22 Study Questions Which of the following statements about the heart is correct? a) the right ventricle is responsible for pumping blood through the systemic circulation. b) normally the sympathetic and parasympathetic nervous systems do not influence heart rate. c) the pulmonary valve prevents the backflow of blood into the right ventricle. d) the coronary arteries branch from blood vessels coming from the lungs. e) the P-wave of the ECG is produced by action potentials in the AV node. Which of the following statements about cardiac muscle cells is correct?
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Unformatted text preview: a) they have a pacemaker potential that is much slower than the pacemaker potential of sinoatrial node cells. b) the opening of cell membrane Ca2+ channels causes the fast rise in membrane potential at the start of an action potential c) excitation-contraction coupling occurs when Ca2+ binds tropomyosin. d) an increase in the release of Ca2+ during excitation can increase the force of contraction. e) a and d. Correct answers: 1. c. 2. e....
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