AN_S_214_Koltes_chelseap_Practice_Final_KEY.docx

A resting membrane potential b epsp c action

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a. Resting membrane potential b. EPSP c. Action potential d. IPSP 13. During which phase of an action potential are voltage-gated K+ channels open, while voltage gated Na+ channels closed? a. Repolarizing phase
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b. Resting state c. Regeneration d. Depolarizing phase 14. A neuron will not respond to a second stimulus of equal strength to the first stimulus to which it has already responded because: a. The neuron is myelinated. b. Action potential generation is an all-or-none phenomenon. c. The neuron is in the absolute refractory period. d. Neurons are self-propagating cells. 15. What is the correct sequence of the following events? (beginning with pre-synaptic neuron) 1. Neurotransmitter is released 2. Action potential reaches the axon terminal 3. Calcium ions enter the axon terminal 4. Neurotransmitter binds to receptors on the post-synaptic cell 5. The post synaptic cell depolarizes. a. 2, 3, 1, 4, 5 b. 1, 2, 3, 4, 5 c. 2, 1, 3, 5, 4 d. 3, 2, 1, 5, 4 MUSCLE 16. Myofibrils are composed of repeating contractile elements called: a. Actin b. Myofilaments c. Sarcomeres d. Myosin 17. What would happen if a muscle became totally depleted of ATP? a. The muscle would remain in a contracted state due to an inability to break actin-myosin cross bridges. b. The muscle would exhibit isometric contraction. c. The muscle would relax and lengthen due to an inability to sustain actin-myosin cross-bridges. d. The muscle would exhibit isotonic contraction.
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18. As an axon enters a muscle, it branches into a number of axonal terminals, each of which forms a neuromuscular junction with a single fiber. A motor neuron and all the muscle fibers it supplies is called a: a. Neuromuscular junction. b. Motor end plate. c. Motor unit. d. Synaptic knob. 19. What is the ion released from the terminal cisternae that combines with troponin and removes the blocking action of tropomyosin, resulting in the formation of the cross bridge? a. Na+ b. K+ c. Mg 2+ d. Ca 2+ 20. Which of the following is a regulatory protein of muscle? a. Actin b. Myosin c. Tropomyosin d. Ca 2+ CARDIOVASCULAR 21. Cardiac output is: a. The number of times the heart beats in one minute. b. The number of impulses fired by the SA node in one minute. c. The amount of blood pumped out of the heart during every ventricular contraction d. The amount of blood pumped out of each ventricle in one minute 22. Choose the correct sequence of current flow through the heart wall. a. SA node, Purkinje fibers, AV node, AV bundle of His, right and left bundle branches. b. AV node, Purkinje fibers, AV node, AV bundle of His, right and left bundle branches.
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