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34. in an experimental study of skeletal muscle function, an isolated muscle strip is electrically stimulated from various initial lengths, and tension is recorded in the graph shown. Compared with initial length A, the greater tension generated at initial length B is the result of which of the following? hal tension

34. in an experimental study of skeletal muscle function, an isolated muscle strip is electrically stimulated from various initial lengths, and tension is recorded in the graph shown. Compared with initial length A, the greater tension generated at initial length B is the result of which of the following? hal tension

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Text and Graph Explanation for Educational Website** --- **Study of Skeletal Muscle Function** **Question:** In an experimental study of skeletal muscle function, an isolated muscle strip is electrically stimulated from various initial lengths, and tension is recorded in the graph shown. Compared with initial length A, the greater tension generated at initial length B is the result of which of the following? - A) Decrease in intracellular calcium concentration - B) Decrease in shortening velocity - C) Increase in load - D) Increase in numbers of active cross-bridges - E) Increase in rate of cross-bridge cycling **Correct Answer:** D) Increase in numbers of active cross-bridges **Graph Explanation:** On the right side, there is a graph depicting the relationship between skeletal muscle length and muscle tension. The x-axis represents the skeletal muscle length, and the y-axis represents the muscle tension. The curve demonstrates an increase in muscle tension with increasing muscle length up to a certain point, after which the muscle tension starts to decrease. The graph highlights two points: - **Point A:** An initial length where the tension is at a certain level. - **Point B:** A greater initial length than A, where the tension is significantly higher. --- This graph demonstrates the concept of the length-tension relationship in skeletal muscles, where the optimal overlap between actin and myosin filaments (at greater muscle lengths up to a certain point) leads to maximal muscle tension due to an increased number of active cross-bridges.
Transcribed Image Text:**Text and Graph Explanation for Educational Website** --- **Study of Skeletal Muscle Function** **Question:** In an experimental study of skeletal muscle function, an isolated muscle strip is electrically stimulated from various initial lengths, and tension is recorded in the graph shown. Compared with initial length A, the greater tension generated at initial length B is the result of which of the following? - A) Decrease in intracellular calcium concentration - B) Decrease in shortening velocity - C) Increase in load - D) Increase in numbers of active cross-bridges - E) Increase in rate of cross-bridge cycling **Correct Answer:** D) Increase in numbers of active cross-bridges **Graph Explanation:** On the right side, there is a graph depicting the relationship between skeletal muscle length and muscle tension. The x-axis represents the skeletal muscle length, and the y-axis represents the muscle tension. The curve demonstrates an increase in muscle tension with increasing muscle length up to a certain point, after which the muscle tension starts to decrease. The graph highlights two points: - **Point A:** An initial length where the tension is at a certain level. - **Point B:** A greater initial length than A, where the tension is significantly higher. --- This graph demonstrates the concept of the length-tension relationship in skeletal muscles, where the optimal overlap between actin and myosin filaments (at greater muscle lengths up to a certain point) leads to maximal muscle tension due to an increased number of active cross-bridges.
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