You scored 84 out of 100

You scored 84 out of 100 - You scored 84 out of 100...

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You scored 84 out of 100 Question 1 Your answer is CORRECT. Which statement does not apply to the skeletal muscles? a) They are the only muscles classified as striated. b) They control voluntary body movement. c) They are attached to the bones of the skeleton, causing movement. d) Neither [a] nor [b] apply to skeletal muscles. e) None of these statements apply to skeletal muscles. 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 CORRECT. At the conclusion of the power stroke, a) inorganic phosphate has been released from the myosin. b) actin has been moved toward the M line. c) ADP is released from the myosin head. d) the myosin head is tightly bound to actin. e) All of the above 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. Put these events in the correct chronological sequence. 1. end plate potentials trigger action potentials 2. transverse tubules convey potentials into the interior of the cell 3. acetylcholine binds to receptors on the motor end plate 4. binding sites on actin are uncovered, allowing myosin to bind and carry out power strokes 5. Ca 2+ is released from the sarcoplasmic reticulum
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7. Ca 2+ ions bind to troponin, pulling on tropomyosin a) 5, 3, 2, 1, 4, 7, 6 b) 3, 6, 1, 2, 5, 7, 4 c) 4, 1, 3, 7, 2, 6, 5 d) 2, 4, 7, 6, 3, 1, 5 e) 3, 6, 1, 5, 7, 2, 4 Question 6 Your answer is CORRECT. Which parameters are associated with increased resistance? a) reduced flow b) reduced friction c) increased blood vessel diameter e) All of the above Question 7 Your answer is CORRECT. The depolarization of the pacemaker action potential spreads to adjacent cells through a) gap junctions. b) tight junctions. c) chemical synapses. d) desmosomes. Question 8 Your answer is CORRECT. The steep repolarization phase of the action potentials of myocardial contractile cells is due to which ion(s)? a) Ca 2+ b) K + c) Na + Question 9 Your answer is CORRECT. If the connection between the AV node and bundle of His becomes blocked, a) the ventricles will beat faster. b) the ventricles will beat more slowly. c) the ventricular rate of contraction will not be affected. d) the stroke volume will increase.
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You scored 84 out of 100 - You scored 84 out of 100...

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