Test 3 Spring 09 - You scored 70 out of 100 Question 1 Your...

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You scored 70 out of 100 Question 1 Your answer is CORRECT. The functional unit of skeletal muscle is the: a) smallest contractile component of a muscle fiber b) area between two Z lines c) sarcomere d) all of these answers e) none of these answers Question 2 Your answer is CORRECT. Thick filaments in skeletal muscle are composed of: a) actin b) troponin and tropomyosin c) myosin d) actin, troponin, and tropomyosin e) all of these answers Question 3 Your answer is CORRECT. The contraction cycle is triggered by the rise in __________ released from the SR. a) Na + b) K + c) Ca 2+ d) A and B e) A, B, and C Question 4 Your answer is CORRECT. Which of the following statements regarding skeletal muscle is true: a) Calcium in muscles cells is required for cross-bridges between actin and myosin. b) ATP binds troponin allowing the myosin-binding site on actin to be made available. c) ATP is stored in the sarcoplasmic reticulum. d) Skeletal muscles lack mitochondria e) All of these Question 5 Your answer is CORRECT. In an isotonic contraction, the muscle: a) changes in length and moves the load b) does not change in length but increases tension c) never converts pyruvate to lactic acid d) rapidly resynthesizes creatine phosphate and ATP Question 6
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Your answer is CORRECT. Which of the following method of ATP production is the predominant source of energy for a muscle cell? a) Dephosphorylation of creatine phosphate b) Glycolysis c) Oxidative Phosphorylation d) None of these Question 7 Your answer is CORRECT. Although there are no sarcomeres, smooth muscles still possess thick and thin filaments. a) True b) False Question 8 Your answer is CORRECT. The regulation of smooth muscle contraction is mediated by the phosphorylation of _____ in response to calcium binding to _____. a) myosin, calmodulin. b) actin, calmodulin. c) troponin, calmodulin. d) myosin, troponin. e) actin, troponin. Question 9 Your answer is CORRECT. The purpose of transverse tubules is to a) ensure a supply of Ca 2+ ions through the muscle fiber. b) rapidly conduct action potentials to the interior of the muscle fiber. c) ensure a supply of glycogen throughout the muscle sarcoplasm. d) conduct ATP molecules out of the mitochondria throughout the sarcoplasm. e) All of these statements are true. Question 10 Your answer is INCORRECT. Muscular fatigue is caused by: a) lactic acid accumulation. b) depletion of ATP. c) depletion of ACh. d) both [a] and [b] above. e) all these answers. Question 11 Your answer is INCORRECT. Which of the following is not true regarding the heart:
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a) To prevent their eversion during ventricular contraction, the aortic and pulmonary valves are connected to the ventricular walls by the chordae tendineae and papillary muscle. b) The heart requires its own circulatory circuit to obtain oxygen and nutrients from the blood
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This note was uploaded on 01/05/2012 for the course CHEM 3321 taught by Professor Bean during the Spring '11 term at American Jewish University.

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Test 3 Spring 09 - You scored 70 out of 100 Question 1 Your...

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