final__08_w_ans - PSL 431 Final Exam Thursday, December 11,...

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PSL 431 Final Exam Thursday, December 11, 2008 Name:_______________________________ 1. Which of the following is NOT an example of active transport (primary or secondary)? A. uptake of Ca ++ into the sarcoplasmic reticulum of cardiac muscle B. maintenance of the K + gradient across the plasma membrane C. uptake of nutrients into the gut epithelium D. gas exchange across the alveolo-capillary barrier@ E. all of the above are active transport processes 2. Which of the following proteins is best described by the following description: "A protein widely involved in chemical signaling serving as a relay switch from signals at the plasma membrane to responses in the cytoplasm." A. heterotrimeric G-protein@ B. nicotinic Ach receptor C. calmodulin D. fast V-gated Na + channel E. Na + K + pump ATPase 3. Nicotinic cholinergic receptors are found at the synapses of all the following EXCEPT A. postganglionic sympathetic neurons B. postganglionic parasympathetic neurons C. neuromuscular junction of skeletal muscle D. many types of neurons in the brain E. vagal innveration of the heart@ 4. The fast Na + channel of skeletal muscle DIFFERS from the HCN 'funny' channel in that only the funny channel A. is primarily a Ca ++ channel. B. opens in response to hyperpolarization.@ C. produces a membrane depolarization when open. D. is found exclusively in ventricular muscle fibers. E. is very rapidly activating and inactivating. 5. Which of the following proteins (or their constituent polypeptides) would NOT be synthesized on rough endoplasmic reticulum? A. actin@ B. muscarinic cholinergic receptors C. L-type Ca ++ channels D. nicotinic cholinergic receptors E. insulin 6. Regulation of contraction in cardiac muscle cells is SIMILAR to that of skeletal muscle cells in that both A. show temporal summation. B. require neural stimulation for contraction. C. require phosphorylation of myosin for contraction. D. regulate cross-bridging by altering thin filament activity.@ E. are independent of extracellular Ca ++ .
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PSL 431 Final Exam Thursday, December 11, 2008 Form A Page 2 of 14 7. Fill in the blanks: An increase in cAMP in _________ cells leads to __________. A. atrial muscle fibers; slowing of the heart rate B. arteriolar vascular smooth muscle of skin; vasodilation C. atrial myocytes; bradycardia D. bronchiole smooth muscle; bronchodilation@ E. ventricular myocytes; decreased contractility 8. In which of the following is the opening of an ion channel correctly matched with a change in the membrane potential? (AP= action potential) A. fast transient Ca ++ channel--plateau phase of ventricular AP B. delayed rectifer K + channel -- repolarization phase of neuronal AP@ C. fast Na + channel-- hyperpolarization phase of atrial AP D. L-type Ca ++ channel--pacemaker potential of SA nodal cells E. nicotinic Ach channel -- rapid depolarization phase of ventricular AP 9. Fill in the blanks: Actin and myosin (actomyosin) activity in _________ is regulated by
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This note was uploaded on 12/14/2010 for the course ISS 325 taught by Professor Malloy during the Spring '08 term at Michigan State University.

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final__08_w_ans - PSL 431 Final Exam Thursday, December 11,...

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