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Understanding Muscle Types: Skeletal, Cardiac, and Smooth Muscles

This overview explores the three main types of muscles in the human body: skeletal, cardiac, and smooth muscles. Skeletal muscles are voluntary, striated, and attached to bones, enabling movement and posture support. Cardiac muscles are involuntary, striated, and found only in the heart, facilitating blood circulation. Smooth muscles, also involuntary, lack striations and are responsible for peristalsis in hollow organs. Each muscle type plays a vital role in bodily functions, including movement, posture maintenance, joint stabilization, and heat generation.

janna-mcconnell
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Understanding Muscle Types: Skeletal, Cardiac, and Smooth Muscles

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  1. Muscle

  2. Overview Myo- Mys- Sarco-

  3. Striations Elongated cells Attach to cover the skeleton Power Voluntary skeletal, striated, voluntary Skeletal Muscle

  4. Striated Branched Heart Involuntary Gap junctions  cardiac, striated, involuntary Cardiac Muscle

  5. No striations Walls of hollow visceral organs Involuntary Peristalsis  visceral, nonstriated, involuntary Smooth Muscle

  6. Muscle Functions #1: Producing Movement • Skeletal = locomotion and manipulation • Cardiac = movement of blood through heart. • Smooth = squeezes substances through organ tracts.

  7. Muscle Functions #2 Maintaining Posture

  8. Muscle Functions #3 Stabilizing Joints

  9. Muscle Functions #4 Generating Heat

  10. Muscle Characteristics #1 Excitability or Irritability • Ability to receive and respond to a stimulus.

  11. #2 Contractility - Ability to shorten forcibly when stimulated

  12. #3 Extensibility • Ability to stretch or extend

  13. #4 Elasticity Ability to resume resting length after being stretched

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