QUESTION 1 Maximal tension in a skeletal muscle contraction is generated.. OA When the sarcomeres are at about 100 to 120 percent of their natural length. OB. When the muscle fiber is stretched before the contraction. OC. When the muscle fiber is shortened before the contraction, and there is a maximal zone of overlap. D. When the sarcoplasmic reticulum releases fewer calcium ions. W

QUESTION 1 Maximal tension in a skeletal muscle contraction is generated.. OA When the sarcomeres are at about 100 to 120 percent of their natural length. OB. When the muscle fiber is stretched before the contraction. OC. When the muscle fiber is shortened before the contraction, and there is a maximal zone of overlap. D. When the sarcoplasmic reticulum releases fewer calcium ions. W

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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Question 41 The sliding filament model of contraction involves----- A) Actin and myosin sliding past each other and partially overlapping B) The Z discs sliding over the myofilaments C) Actin in myosin lengthening in order to slide past each other D) The shortening of thick filaments so that the thin filaments slide past Please provide a brief explaination of each one correct or incorrect. THANK YOU!!
QUESTION 24 Which statement is correct? B : ¡C: E A D The structure labeled C is called the A band The structure labeled A is reduced in length during muscle relaxation The structure labeled B is reduced in length during muscle contraction The structure labeled D is called the Z line/disk of
Question 2 Which of these are shortened during a muscle twitch? O Actin O I band மவவு O Z-disc Myosin O Azone
Question 4 1 pts A, B, or C? Which muscle would be more affected by joint angular velocity? A B A is more affected than B. B is more affected than A. O A and B are equally affected.
Question 3 What part of the muscle fiber is a place of storage for calcium ions that is critical for muscle contraction? sarcoplasmic reticulum t-tubules sarcomere G-actin
Question 10. Why does the sarcomere length appear to shorten (from Z line to Z line) when a muscle contracts?
Question 41 The sliding filament model of contraction involves----- A) Actin and myosin sliding past each other and partially overlapping B) The Z discs sliding over the myofilaments C) Actin in myosin lengthening in order to slide past each other D) The shortening of thick filaments so that the thin filaments slide past Please explain why correct and incorrect shortly
QUESTION 9 How is smooth muscle contraction regulated differently from striated skeletal muscle contraction? A. Smooth muscle has organized parallel arrays of myofilaments. B. Smooth muscle cells contract only through voluntary control. C. Smooth muscle does not have myosin filaments. D. Smooth muscle does not respond to elevations in intracellular Ca2+ levels. E. Smooth muscle does not have troponin.
52. While the muscle is contracting, the ___________
QUESTION 16 If the concentration of calcium ion (Ca2*) in the cytosol of a skeletal muscle cell is low, then troponin covers the actin binding sites on the thick filament troponin holds the myosin light chains in a strained conformation tropomyosin prevents the cross-bridges from being energized tropomyosin covers the myosin binding sites on the thin filament