13. Acetylcholinesterase is an enzyme located on er immediately outside the A) presynaptic membrane B) postsynaptic memb

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13 Acetylcholinesterase Is An Enzyme Located On Er Immediately Outside The A Presynaptic Membrane B Postsynaptic Memb 1 (121.24 KiB) Viewed 49 times

13. Acetylcholinesterase is an enzyme located on er immediately outside the A) presynaptic membrane B) postsynaptic membrane C) axon terminal cytoplasen D) vesides released by exocytosis 14. During neuron stimulation, a fraction of a second after the Nut gates open, they close again. Meanwhile, the renulting depolarization causes the K+ gates to open, allowing the efflux (outward flow) of K+, AJTrue OR B) False 15. A negative feedback loop is created as the rate of Na+ entry increases as the rate of membrane depolarization increases in an explosive fashion A) True OR 16. Since K is positively charged, the diffusion of it down les concentration gradient and out of the cell results in hyperpolarization B) False A) True OR B) False 17. During skeletal muscle contraction A) the width of the H-zone decreases B) the actin heads bind to the myosin choin. ATP hydrolysis requires Ca2+ as a cofactor D) tropomyosin changes conformation when Cn2 binds. 18. Drugs which activate beta-1 receptors would A) stimulate relaxation of the bronchiolar imooth muscle B) stimulate uterine contraction. C) stimulate sweating D) increase heart rate. 19. Concerning the actions of the sympathetic and parasympathetic divisions A) the actions on the salivary gland are complimentary. B) the actions on the heart are antagonistic C) the actions on the urinary system are cooperative. D) all of the above 20. Sensory receptors A) are classified functionally based on their adequate stimulus. B) adapt to maintained constant stimulation C) when stimulated always induce perception of the adequate stimulus. D) all of the above. 21. Which of the following is normally due to a loss of accommodation! Glaucoma B) Hyperopia A)