Answered: 100 75 50 25 2 3 sarcomere length (um)…

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

Detailed measurements of sarcomere length and
tension during isometric contraction in striated muscle
provided crucial early support for the sliding-filament
model of muscle contraction. Based on your understand-
ing of the sliding-filament model and the structure of a
sarcomere, propose a molecular explanation for the rela-
tionship of tension to sarcomere length in the portions of
Figure Q16–1 marked I, II, III, and IV. (In this muscle, the
length of the myosin filament is 1.6 μm, and the lengths of
the actin thin filaments that project from the Z discs are 1.0
μm.)

100
75
50
25
2
3
sarcomere length (um)
Figure Q16-1 Tension as a function of sarcomere length during
isometric contraction (Problem 16-5).
tension (% of maximum)

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