Study Guide for Campbell Biology
Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 50, Problem 18TYK

How does calcium affect muscle contraction?

  1. a. It is released from the T tubules in response to an action potential and initiates contraction.
  2. b. The binding of acetylcholine opens calcium channels in the plasma membrane, creating an action potential that travels down the T tubules.
  3. c. It binds to tropomyosin and helps to stabilize cross-bridge formation.
  4. d. Its binding to troponin causes tropomyosin to move away from the myosin-binding sites on the actin filament.
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