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09 pract-key - out Note the scale on the figure See how...

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Answers to Lesson 9 Practice Set Cardiac Electrophysiology, Cardiac Cycle, and Control of Cardiac Output Part 1. Cardiac Electrophysiology 1. 7 ventricular myocytes 2 atrial myocytes 1 sinoatrial nodal cells 3 atrioventricular nodal cells 4 common bundle of His 5 bundle branches 6 Purkinje fibers 2. a. pacemaker cell b. none c. none d. none e. A and B f. mainly C g. A h. D, E 3. a. cardiac muscle cell b. A c. A, B, C, D, E d. A, B, C, D, E e. A, B, C, D, E f. (Beginning of) B g. C h. none i. C, E j. B 4. a. K + b. voltage-gated Na + c. [Na + ] out d. voltage-gated Na + , slow type L voltage-gated calcium channels e. Ca ++ , slow type L voltage-gated calcium channels f. K + g. [Ca ++ ] out h. [K+] in 5. in A: Tetrodotoxin (TTX) in B: Diltiazem
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Part 2. The Autonomic Innervation of the Heart a. 75 beats/minute. Note: There could easily be a question in an exam that requires you to be able to figure this
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Unformatted text preview: out! Note the scale on the figure. See how often action potentials are occurring. Change the rate to beats/minute. b. ACh, muscarinic, metabotropic, K + , negative , less, ↑ , ↓ , ↓ c. ganglia very near the SA node d. vagus, brainstem e. NE, EPI, beta adrenergic, metabotropic, Na + , more, ↓ , ↑ , ↑ f. upper sympathetic chain ganglia g. upper thoracic spinal cord in the intermediolateral column. h. NE, EPI, beta adrenergic, metabotropic, increased, increased, increasing, L, D, increasing, sarcoplasmic reticulum, increase, increased, increases Part 3. The Cardiac Cycle 1. c 2. c, d 3. e, b 4. c 5. c, d 6. b, c 7. c, d 8. d 9. d, e 10. d, e 11. a 12. c 13. c 14. e 15. b, c 16. d, e 17. c 18. b 19. a 20. b 21. b, c 22. c, d...
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