Instructions

What is the state of most of the voltage-gated channels at point E? a. Na inactivation gates open, Na activation gates closed, K- gates open b. Na inactivation gates closed, Nar activation gates closed, K gates open c. Na inactivation gates open, Nar activation gates closed, K gates closed d. Na inactivation gates closed, Na activation gates open, K- gates closed e. Na inactivation gates open, Nar activation gates open, K gates open 39. Imagine if you could experimentally depolarize the middle of a motor axon to threshold using an electronic probe. What would happen? (Assume that the axon is at RMP prior to stimulation.) No action potential will be initiated. An action potential will be initiated and proceed only in the normal direction towar the axon terminal. An action potential will be initiated and proceed only back toward the axon hillock Two action potentials will be initiated, one going toward the axon terminal and one going back toward the hillock. An action potential will be initiated, but it will die out before it reaches the axon terminal. a. b. c. d. e. 40. After Qi chewed a bite of his sandwich he swallowed. The masticated food entered his stomach. What is not a function of the stomach? Mechanically breaks down food. a. b. Kills bacteria and other pathogens. Begins protein digestion. d. c. Activates enzymes that break down carbohydrates. 41. What events occurred to digest the mayonnaise (contains fat) in Qi’s tuna salad sandwich? a. Lipases from the pancreas where secreted into the small intestine. b. Bile was released into the small intestine. c. Micelles formed. d. Chylomicrons entered lacteals in the villi. e. All of the above occurred 13

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