Muscle tissue - Smooth muscle tissue contracts to move substances within internal passageways

4 important questions on Muscle tissue - Smooth muscle tissue contracts to move substances within internal passageways

What are the various body systems that smooth muscles play a role in?

  • Integumentary sytem
  • Cardiovascular system
  • Respiratory system
  • Digestive system
  • Urinary system
  • Reproductive system

Identify the structural characteristics of smooth muscle tissue.

Smooth muscle cells lack sarcomeres, and thus smooth muscle tissue is nonstriated. Additionally, the thin filaments are anchored to dense bodies.

Which type of muscle tissue is least affected by changes in extracellular Ca2+ concentration during contraction?

Skeletal muscle contractions are least affected by changes in extracellular Ca2+ concentrations. In skeletal muscle, most of the calcium ions come from the sarcoplasmic reticulum. Most of the calcium ions that trigger a contraction in cardiac and smooth muscles come from the extracellular fluid.
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Why can smooth muscle tissue contract over a wider range of resting lengths than skeletal muscle can?

The looser organization of actin and myosin filaments in smooth muscle allows smooth muscle to contract over a wider range of resting lengths than skeletal muscle.

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