Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 35, Problem 12SQ

A motor unit is _________.

  1. a. a muscle and the bone it moves
  2. b. two muscles that work in opposition
  3. c. the amount a muscle shortens during contraction
  4. d. a motor neuron and the muscle fibers it controls
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In relaxed muscle, the myosin-binding site on actin is blocked by ________. a. titin b. troponin c. myoglobin d. tropomyosin
Muscle relaxation occurs when ________. a. calcium ions are actively transported out of the sarcoplasmic reticulum b. calcium ions diffuse out of the sarcoplasmic reticulum c. calcium ions are actively transported into the sarcoplasmic reticulum d. calcium ions diffuse into the sarcoplasmic reticulum
In sustained, moderate exercise, skeletal muscle is predominantly using ______________ as its energy source. a. amino acids b. glucagon c. fatty acids d. creatine phosphate
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