Exam 3'08 - Test 3 Question 1 Your answer is CORRECT The functional unit of skeletal muscle is the a smallest contractile component of a muscle

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Test 3 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. The H zone contains a) thick filaments. b) thin filaments. c) an area of overlapping filaments. d) all of the above e) none of the above Question 3 Your answer is INCORRECT. According to the sliding filament mechanism of muscle contraction, the thick filaments slide towards the M line to shorten the sarcomere. a) True b) False Question 4 Your answer is CORRECT. In muscles used for fine actions, such as controlling eye movement or use of the hand, a motor unit will have __________ muscle fibers when compared to a motor unit in muscles used for power and strength. a) hundreds more b) very few c) approximately the same numbers of d) Any of these answers could be correct, as this is impossible to predict. 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 Your answer is INCORRECT.
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muscle cell? a) Dephosphorylation of creatine phosphate b) Glycolysis c) Oxidative Phosphorylation d) None of these Question 7 Your answer is CORRECT. Because there are no sarcomeres, smooth muscles do not possess thick and thin filaments. a) True b) False Question 8 Your answer is CORRECT. Which chemical(s) is/are required for contraction of smooth muscle fibers? a) calcium. b) calmodulin. c) phosphate. d) ATP. e) all of these answers. Question 9 Your answer is CORRECT. The T tubule is responsible for storing Ca 2+ for muscle contractions. a) True b) False Question 10 Your answer is CORRECT. 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 CORRECT. Which of the following is not true regarding the heart: 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 because it can not obtain them from the blood being pumped in the chambers c) The left ventricular wall possesses more muscle (and is thicker) than the right ventricular wall. d) There are no valves lying between the atria and the veins. e)
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This note was uploaded on 07/27/2011 for the course BIOL 3324 taught by Professor Ziburkus during the Fall '07 term at University of Houston.

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Exam 3'08 - Test 3 Question 1 Your answer is CORRECT The functional unit of skeletal muscle is the a smallest contractile component of a muscle

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