PhysiologyLesson 4 of 4 in the course The Musculoskeletal System

Muscle Tissue Types and Skeletal Muscle Contraction

5 flashcards · 4 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Muscle tissue produces movement, supports essential internal processes, and enables the body to respond to its needs. This lesson compares the three types of muscle tissue and connects their structures to their functions.

Muscle cells are specialized to contract. Their contractions move body parts and also help carry out processes such as breathing and digestion. The body has three main types of muscle tissue: skeletal, smooth, and cardiac muscle.

All flashcards

Skeletal muscle fiber
A single skeletal muscle cell, containing many myofibrils and typically multiple nuclei.
Sarcolemma
The plasma membrane of a muscle fiber; it conducts action potentials.
I band
The lighter sarcomere band containing thin filaments but no thick filaments.
Tropomyosin
A thin-filament protein that covers actin’s myosin-binding sites when muscle is at rest.
Excitation–contraction coupling
The process linking a muscle-fiber action potential to calcium release and contraction.

Quiz questions

  1. As a sarcomere shortens, which structure remains the same length?Answer: The A band
  2. What directly causes myosin to detach from actin during the cross-bridge cycle?Answer: ATP binds to myosin
  3. Which protein binds calcium to help expose myosin-binding sites on actin?Answer: Troponin
  4. Which enzyme breaks down acetylcholine in the neuromuscular junction?Answer: Acetylcholinesterase

Based on Biology 2e by Mary Ann Clark, Matthew Douglas, Jung Choi (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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