Test 3-I. - Test 3 You scored 78 out of 100 Question 1 Your answer is CORRECT Summation a Results from increases in cytosolic calcium levels b

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Test 3 You scored 78 out of 100 Question 1 Your answer is CORRECT. Summation: a) Results from increases in cytosolic calcium levels. b) Pumping of calcium into the sarcoplasmic reticulum. c) Can be enhanced by allowing a cell to completely relax. d) Rarely results in tetanus. e) All of these answers. Question 2 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 3 Your answer is CORRECT. With eccentric muscle contractions: a) The development of tension occurs at constant muscle length. b) The muscle lengthens while contracting. c) The muscle shortens while contracting. d) Muscle length and tension vary throughout a range of motion. e) None of these answers. Question 4 Your answer is CORRECT. A motor unit refers to: a) a single motor neuron plus all of the muscle fibers it innervates. b) a single muscle fiber plus all of the motor neurons that innervate it. c) all of the motor neurons supplying a single muscle. d) a pair of antagonistic muscles. e) a sheet of smooth muscle cells connected by gap junctions. Question 5 Your answer is CORRECT. Calcium that enters the cell during smooth muscle excitation binds with: a) calmodulin. b) inactive myosin kinase. c) troponin. d) myosin. e) actin. Question 6 Your answer is CORRECT.
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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 7 Your answer is CORRECT. Blood returning from the systemic circulation: a) enters the right atrium. b) enters the left atrium c) is poorly oxygenated. d) both [a] and [c] above e) both [b] and [c] above Question 8 Your answer is CORRECT. The plateau of the cardiac action potential results from the opening of voltage-gated slow _____ channels in the plasma membrane of the cardiac cell. a) sodium b) potassium c) calcium d) chloride e) magnesium Question 9 Your answer is CORRECT. Which of the following ECG waves represents ventricular depolarization? a) P wave b) QRS complex c) T wave d) PR segment e) ventricular depolarization occurs simultaneously with atrial repolarization and can not be recorded. Question 10 Your answer is CORRECT. Which of the following conditions exist during the TP interval? a) Ventricular pressure is greater than atrial pressure. b) The AV valves are closed. c) Ventricles are filling with blood. d) Ventricular pressure is greater than aortic pressure. e) None of these.
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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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Test 3-I. - Test 3 You scored 78 out of 100 Question 1 Your answer is CORRECT Summation a Results from increases in cytosolic calcium levels b

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