Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 47.1, Problem 1R
Summary Introduction
To review:
The reason due to which isotropic (I) () band and H zone get smaller, while no change in anisotropic (A) band is observed during the contraction of the skeletal muscle
Introduction:
The basic unit of every organ is cell; however, the specific cells themselves are composed of some simple units, like muscle cells are composed of the myofibrils. The myofibrils contain actin (thin) and myosin (thick) bundles, which are organized in a well-ordered fashion. The myofibril, in turn, is composed of the sarcomeres which are repeated in an order.
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Life: The Science of Biology
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- What is the function of the sarcoplasmic reticulum in muscle cell contraction?arrow_forwardIn the diagram below, label the fine structure of a muscle, down to one of its myofibrils. Identify the basic unit of contraction in a myofibril.arrow_forwardHow do actin and myosin interact in a sarcomere to bring about muscle contraction? What roles do ATP and calcium play?arrow_forward
- Explain why (a) calcium ions and (b) ACh are vital for muscle contraction.arrow_forwardHow does a muscle fiber incur an oxygen debt?arrow_forwardWatch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the junction points between sarcomeres? (b) What are the names of the subunits within the myofibrils that run the length of skeletal muscle fibers? (c) What is the “double strand of pearls� described in the video? (d) What gives a skeletal muscle fiber its striated appearance?arrow_forward
- After death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.arrow_forwardFigure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.arrow_forward
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