Which statement about striated skeletal muscle is true?   A. The tension generated by a muscle is invariable.   B. Mechanical summation of twitches in a muscle fiber leads to a graded increase in the tension that is above that generated by a single twitch.   C. A single action potential arriving at the neuromuscular junction is not sufficient to cause a muscle fiber to twitch.   D. Muscle twitches are able to mechanically sum when Ca2+ is quickly and completely removed from the sarcoplasm between action potentials.   E. An action potential in the muscle cell activates contraction by releasing Na+ into the sarcoplasm.

Concepts of Biology
1st Edition
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:Samantha Fowler, Rebecca Roush, James Wise
Chapter16: The Body's System
Section: Chapter Questions
Problem 22RQ: Which component is responsible for initially stimulating a muscle contraction? a. proteins b....
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Which statement about striated skeletal muscle is true?

  A.

The tension generated by a muscle is invariable.

  B.

Mechanical summation of twitches in a muscle fiber leads to a graded increase in the tension that is above that generated by a single twitch.

  C.

A single action potential arriving at the neuromuscular junction is not sufficient to cause a muscle fiber to twitch.

  D.

Muscle twitches are able to mechanically sum when Ca2+ is quickly and completely removed from the sarcoplasm between action potentials.

  E.

An action potential in the muscle cell activates contraction by releasing Na+ into the sarcoplasm.

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