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Muscle Tissue and the Mode of Contraction Practice Problems

By — McGraw-Hill Professional
Updated on Aug 18, 2011

Review these concepts if necessary:

Muscle Tissue and the Mode of Contraction Practice Problems

Practice—Matching

1. Z line (a) flat protein structure to which the thin filaments attach
2. Sarcomere (b) basic unit of a muscle fiber
3. A band (c) intramuscular saclike structures (tubules) derived from membranes
4. Sarcoplasmic reticulum (d) structure that binds calcium
5. Troponin (e) "trigger" or regulator of contraction
6. Calcium (f) composed mainly of myosin molecules
7. ATP-myosin complex (g) functions to release the energy in ATP

Answers

  1. a
  2. b
  3. f
  4. c
  5. d
  6. e
  7. g

Practice—True or False

  1. Actin is found only in the striated fibers of cardiac and skeletal muscle tissues. 
  2. Fasciculi are enclosed in a covering of perimysium. 
  3. Thin myofilaments are primarily composed of myosin proteins. 

Answers

  1. False
  2. True
  3. False
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