nsverse (1) system E plasn -twitch muscles dark? A. They have many more mylbll e
ID: 213526 • Letter: N
Question
nsverse (1) system E plasn -twitch muscles dark? A. They have many more mylbll er IO ast-twitch fibers. D. They contain myoglobin. E. They have fewer mitochondria. on is responsible for initiating muscle contraction? A. Mg B. CaC. r D. Cr B. They are designed for strength and explosions of energy. C. They need 18- E. Na 19. oes troponin bind to and what happens when it binds? A. Ca, tropomyosin shifts B. tropomyosin, the sarcomere relaxes C. acetylcholine, the sarcome shortens D. ATP, tropomyosin rela to normal position E. T tubules, the sarcomere shortens One motor unit obeys a principle called Why is the innervation ratio in the ocular muscles one motor axon per 23 muscle fibers, 20- the all-or-none law. A. True. B. False 21- whereas in the gastrocnemius more nerves in the upper body than in the lower extremities. B. The ocular muscles require finer control than moving the bigger the muscle, the fewer the muscle fibers per motor axon. D. The gastrocnemius muscle contracts much harder than the ocular muscles do. E. There are fewer muscle fibers in the gastrocnemius muscle than in the ocular muscles. muscle it is one motor axon per 1000 muscle fibers? A. There are the legs. C. The innervation ratio has to do with the overall size of the muscle- 22- What is happening during the latent period of a muscle twitch? A. The muscle relaxes and returns to its former length. B. Fresh ATP binds to the myosin causing it to return to its resting position. C. ADP and phosphate are released, and the power stroke of the contraction occurs. D. The in cross-bridges are broken and the sarcomere shortens. E. The neurotransmitter is myosin-actin diffusing across the synaptic cleft causing an electrical signal in the muscle cell. Which of the following does not occur when a muscle fatigues? A. Its energy reserves are 23- leted. B. Stimulation continues. C. Tetanus is achieved. D. Acetylcholine is crossing the synaptic cleft. E. The muscle relaxes h of the following is not an energy source for muscle contraction? A. glycogen 24-Explanation / Answer
17. The correct option is D. They contain myoglobin.
Slow twitch muscles are dark due to the presence of myoglobin.
18. The correct option is B. Ca2+.
Ca2+ is responsible for muscle contraction.
19. The correct option is A. Ca2+, tropomyosin shifts.
Ca2+ binds to troponin and tropomyosin shifts.
20. The correct option is A. True.
The statement is true.
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