Muscle Function

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Author:
bbarratt
ID:
148542
Filename:
Muscle Function
Updated:
2012-04-19 06:28:46
Tags:
Physiology
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Description:
Muscle Function
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  1. What are the 3 types of muscle mass in the body?
    • (1) Skeletal - voluntary, attached to bones
    • (2) Cardiac - involuntary, in the heart
    • (3) Smooth - involuntary, in the walls of the hollow visceral organs (not the heart)
  2. What are the 4 functions of muscle mass and which type of muscle play a role in each?
    • (1) Movement
    • Skeletal - locomotion and manipulation
    • Cardiac - provides pressure for movement of blood
    • Smooth - helps maintain BP

    • (2) Postural Maintenance
    • Skeletal - maintain posture

    • (3) Joint Stability
    • Skeletal - contribute

    • (4) Heat generation
    • Skeletal - responsible for most of heat generation
    • (muscles generate heat when contract)
  3. What are elasticity and plasticity?
    • Elasticity = ability of a muscle to STRETCH
    • Plasticity = ability to take new stretched form
  4. What is the role of the T-tubules?
    Transfer-tubules = allow nerve impulses to transfer from one side of the muscle to the other
  5. Explain the role of ATP and Ca in contraction and relaxation
    • ATP required for both
    • ATP = energy supply for contraction - required for sliding of the filaments
    • = required for separation of actin and myosin (relaxing)
    • Ca triggers muscle contraction, if ATP is present, the muscle will contract
  6. What are the 6 phases of muscle contraction?
    • (1) Ca influx exposes binding sites on actin
    • (2) Actin and myosin bind
    • (3) Power stroke filaments slide over each other
    • (4) ATP binds to x-bridges releasing actin
    • (5) Hydrolysis of ATP to ADP and Pi
    • (6) Ca transported to SR

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