BIO201 Topic 9: Muscular System Histology and Physiology Quiz {GRADED A+) | Straighterline.

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Quiz 9 Muscular System Histology and Physiology Which of the following is true during the resting membrane potential? Select one: a. Sodium ion concentration is greater inside cells. b. Negativ... ely charged proteins are more concentrated outside the cell. c. A greater concentration of calcium ions is found inside the cell. d. Potassium is concentrated primarily inside the cell. e. None of these choices reflect what occurs during the resting membrane potential. Feedback The correct answer is: Potassium is concentrated primarily inside the cell. Question 2 Correct 2.00 points out of 2.00 Flag question Question text The refractory period Select one: a. is the time during which the tissue cannot respond again. b. results in complete and incomplete tetanus. c. is the condition in which the muscle fiber only partially relaxes between contractions. d. is the condition in which stimuli occur so rapidly that there are no intervening relaxations. e. is the constant tension produced by muscles for long periods of time. Feedback The correct answer is: is the time during which the tissue cannot respond again. Question 3 Correct 2.00 points out of 2.00 Flag question Question text Which of the following helps explain the increased tension seen in multiple wave summation? Select one: a. increased motor unit recruitment b. increased concentration of calcium ions around the myofibrils c. exposure of more active sites on myosin myofilaments d. the breakdown of elastic elements in the cell e. decreased stimulus frequency Feedback The correct answer is: increased concentration of calcium ions around the myofibrils Question 4 Incorrect 0.00 points out of 2.00 Flag question Question text What does "E" represent on the diagram? Select one: a. myosin myofilament b. actin myofilament c. sarcomere d. Z disk e. cross-bridge Feedback The correct answer is: sarcomere Question 5 Correct 2.00 points out of 2.00 Flag question Question text A child ingested an organophosphate poison used to kill insects. Soon the child's muscles began spastic contractions. Predict what occurred at the synaptic cleft. Select one: a. decreased release of acetylcholine from presynaptic neurons b. increased accumulation of acetylcholine in the synapse c. the poison binds to acetylcholine receptors and stimulates them d. increased breakdown of acetylcholine in the synaptic cleft e. Both increased accumulation of acetylcholine in the synapse and increased breakdown of acetylcholine in the synaptic cleft. Feedback The correct answer is: increased accumulation of acetylcholine in the synapse Question 6 Correct 2.00 points out of 2.00 Flag question Question text Smooth muscle Select one: a. responds in an all-or-none fashion. b. depolarizes when both sodium and calcium ions diffuse into the cell. c. has fast waves of depolarization. d. has fast waves of repolarization. e. has a resting membrane potential that is more negative than skeletal muscle fibers. Feedback The correct answer is: depolarizes when both sodium and calcium ions diffuse into the cell. Question 7 Correct 2.00 points out of 2.00 Flag question Question text The figure illustrates the neuromuscular junction. What does "E" represent? Select one: a. presynaptic terminal b. muscle fiber c. neuromuscular junction d. axon branch e. myofibrils Feedback The correct answer is: presynaptic terminal Question 8 Correct 2.00 points out of 2.00 Flag question Question text Which type of muscle tissue is autorhythmic? Select one: a. skeletal muscle b. smooth muscle c. cardiac muscle d. both skeletal and cardiac muscle e. both cardiac and smooth muscle Feedback The correct answer is: both cardiac and smooth muscle Question 9 Correct 2.00 points out of 2.00 Flag question Question text Which type of respiration do resting muscles depend upon? Select one: a. anaerobic respiration b. aerobic respiration c. both anaerobic and aerobic respiration Feedback The correct answer is: aerobic respiration Question 10 Correct 2.00 points out of 2.00 Flag question Question text Smooth muscle is regulated by all of the following except Select one: a. the autonomic nervous system. b. neurotransmitters. c. the somatic nervous system. d. hormones. e. prostaglandins. Feedback The correct answer is: the somatic nervous system. Question 11 Correct 2.00 points out of 2.00 Flag question Question text What type of muscle tissue causes vasoconstriction? Select one: a. skeletal muscle b. smooth muscle c. cardiac muscle Feedback The correct answer is: smooth muscle Question 12 Correct 2.00 points out of 2.00 Flag question Question text Cardiac muscle cells are like skeletal muscle cells in that they both Select one: a. have striations. b. depolarize as a result of sodium and calcium influxes. c. possess intercalated disks. d. lack sarcomeres. e. are multinucleated. Feedback The correct answer is: have striations. Question 13 Correct 2.00 points out of 2.00 Flag question Question text Muscles exhibit the property of excitability. This means that the muscle Select one: a. shortens its length. b. recoils to its original resting length. c. stretches beyond its normal length. d. responds to stimulation by the nervous system. e. excites itself. Feedback The correct answer is: responds to stimulation by the nervous system. Question 14 Correct 2.00 points out of 2.00 Flag question Question text Intense exercise that results in a great deal of anaerobic activity Select one: a. converts some slow-twitch fibers into fast-twitch fibers. b. increases muscular strength and mass. c. enlarges slow-twitch fibers. d. decreases the efficiency of fast-twitch fibers. e. decreases muscle strength and mass. Feedback The correct answer is: increases muscular strength and mass. Question 15 Correct 2.00 points out of 2.00 Flag question Question text What is tropomyosin? Select one: a. a protein found along the groove of the F-actin double helix b. a T tubule and two adjacent terminal cisternae c. the combination of myosin heads with active sites on actin molecules d. the movement of myosin head while attached to actin myofilament e. after exercise, the oxygen taken in that exceeds the oxygen required for resting metabolism Feedback The correct answer is: a protein found along the groove of the F-actin double helix Question 16 Correct 2.00 points out of 2.00 Flag question Question text Depolarization of the cell membrane occurs when there is a rapid influx (inflow) of Select one: a. potassium ions. b. chloride ions. c. calcium ions. d. sodium ions. e. amino acids. Feedback The correct answer is: sodium ions. Question 17 Correct 2.00 points out of 2.00 Flag question Question text Which of the following is NOT a function of skeletal muscle? Select one: a. body movement b. maintenance of posture c. respiration d. constriction of organs e. production of heat Feedback The correct answer is: constriction of organs Question 18 Correct 2.00 points out of 2.00 Flag question Question text Which of the following statements concerning slow-twitch oxidative muscle fibers is false? Select one: a. They split ATP slowly. b. They have large deposits of myoglobin. c. They are well adapted to anaerobic activity. d. They have a well developed blood supply. e. They have low glycogen stores. Feedback The correct answer is: They are well adapted to anaerobic activity. Question 19 Correct 2.00 points out of 2.00 Flag question Question text Smooth muscle and cardiac muscle are similar in that they both Select one: a. are under involuntary control. b. are striated. c. are widely distributed in the body. d. have multiple nuclei. e. are under voluntary control. Feedback The correct answer is: are under involuntary control. Question 20 Incorrect 0.00 points out of 2.00 Flag question Question text If the resting membrane potential becomes more negative, which of the following has occurred? Select one: a. hyperpolarization b. repolarization c. depolarization d. isopolarization e. hypopolarization Feedback The correct answer is: hyperpolarization [Show More]

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