When neurotransmitters contact a muscle cell's receptor proteins, those receptors change their shape and let ions go through the membrane. The receptors are an example of: A. voltage sensitive channels B. tension-sensitive channels C. ligand-activated channels

When neurotransmitters contact a muscle cell's receptor proteins, those receptors change their shape and let ions go through the membrane. The receptors are an example of: A. voltage sensitive channels B. tension-sensitive channels C. ligand-activated channels

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

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter7: The Peripheral Nervous System: Efferent Division

Section: Chapter Questions

Problem 4RE

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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.

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The figure below shows the muscle tension (Y axis) following the application of stimuli to the muscle fiber. The pink arrows on the bottom symbolize stimuli to the muscle cell. The best explanation that the tension of the contraction in panel 4 is larger than other panels is because: A. More motor units are recruited B. More muscles are contracting C. The duration of the stimuli is longer D. The frequency of the stimuli is greater
Which of the following statements best describes the sliding filament mechanism of muscle contraction? a. Actin and myosin filaments do not shorten, but rather, slide past each other. b. Actin and myosin filaments shorten and slide past each other. c. As they slide past each other, actin filaments shorten, but myosin filaments do not shorten. d. As they slide past each other, myosin filaments shorten, but actin filaments do not shorten.
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