Which of the following summarizes the role of acetylcholinesterase in muscle contraction? O opens the receptor site for cross bridge activity O increases acetylcholine so muscle contractions will increase O degrades acetylcholine so muscle contraction will stop neurotransmitter that initiates the motor impulse for a contraction to occur

Which of the following summarizes the role of acetylcholinesterase in muscle contraction? O opens the receptor site for cross bridge activity O increases acetylcholine so muscle contractions will increase O degrades acetylcholine so muscle contraction will stop neurotransmitter that initiates the motor impulse for a contraction to occur

Lifetime Physical Fitness & Wellness

15th Edition

ISBN:9781337677509

Author:HOEGER

Publisher:HOEGER

Chapter7: Muscular Fitness

Section: Chapter Questions

Problem 5AYK

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Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
Skeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the above
Nerve impulses first stimulate a skeletal muscle fiber at _______. a. T tubules b. sarcomeres c. neuromuscular junctions d. actin binding sites
After death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.
The _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filament
Every skeletal muscle fiber is supplied by a motor neuron at the NMJ. Watch this video (http://openstaxcollege.org/l/skelmuscfiber) to learn more about what happens at the neuromuscular junction. (a) What is the definition of a motor unit? (b) What is the structural and functional difference between a large motor unit and a small motor unit? Can you give an example of each? (c) Why is the neurotransmitter acetylcholine degraded after binding to its receptor?
Cheetahs and human sprinters tend to have a high proportion of ________fibers in their leg muscles. a. white b. fast red c. slow red
The release of calcium ions initiates muscle contractions. Watch this video (http://openstaxcollege.org/l/calciumrole) to learn more about the role of calcium. (a) What are â€œT-tubulesâ€� and what is their role? (b) Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
Which of the following are true regarding processes that are involved in the Relaxation Period of a muscle twitch? (choose all that apply) O This is the fırst phase where the "cross-bridge" occurs O ATP binds to the Myosin head to release it from Actin n Calcium is removed from sarcoplasm and returned to sarcoplasmic reticulum O This is the phase that begins the depolarization of the sarcolemma O Acetylcholinesterase helps to remove Acetylcholine from the synapse