Which of the following summarizes the role of calcium in muscle contraction? opens the binding sites for cross bridge activity neurotransmitter that initiates the motor impulse for a contraction to occur restabilizes the ion concentration for sustained contractions

Which of the following summarizes the role of calcium in muscle contraction? opens the binding sites for cross bridge activity neurotransmitter that initiates the motor impulse for a contraction to occur restabilizes the ion concentration for sustained contractions

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter8: Muscle Physiology

Section: Chapter Questions

Problem 13RE

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Concept explainers

Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.

Question

Which of the following summarizes the role of calcium in muscle contraction?
opens the binding sites for cross bridge activity
neurotransmitter that initiates the motor impulse for a contraction to occur
restabilizes the ion concentration for sustained contractions

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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
The _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filament
Explain why (a) calcium ions and (b) ACh are vital for muscle contraction.
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.
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 O neurotransmitter that initiates the motor impulse for a contraction to occur
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
Which of the following does not occur during the excitation contraction coupling of skeletal muscle? Opening of ryanodine receptor calcium channels Calcium binding to troponin Tropomyosin shifting away from myosin binding sites on the actin An end plate potential