Difference between revisions of "Muscles - Anatomy & Physiology"
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| Line 2: | Line 2: | ||
| − | + | ==Introduction== | |
| + | Muscular contraction is necessary for voluntary and involuntary movement of limbs, stabilization of joints, maintaining luminal diameter (in the case of arteries, bowel, etc), and to produce heat. Three types of muscle can be described: | ||
| + | *Skeletal (aka Striated, Somatic, Voluntary) | ||
| + | *Smooth (aka Visceral) | ||
| + | *Cardiac | ||
| + | ==Skeletal Muscle== | ||
*Skeletal muscle includes muscles of: | *Skeletal muscle includes muscles of: | ||
**Posture | **Posture | ||
Revision as of 12:42, 21 July 2008
Introduction
Muscular contraction is necessary for voluntary and involuntary movement of limbs, stabilization of joints, maintaining luminal diameter (in the case of arteries, bowel, etc), and to produce heat. Three types of muscle can be described:
- Skeletal (aka Striated, Somatic, Voluntary)
- Smooth (aka Visceral)
- Cardiac
Skeletal Muscle
- Skeletal muscle includes muscles of:
- Posture
- Movement
- Respiration
- Two basic types of skeletal myofibre:
- Type I
- Grossly red
- High myoglobin level
- Slow rate of contraction
- High oxidative activity
- Function - postural
- Type II
- Grossly white
- Low myoglobin level
- Fast rate of contraction
- High glycolytic activity
- Function - exercise
- Type I
- Each muscle is composed of multiple fascicles
- Each fascicle is composed of multiple polygonal myofibres
Tendon
- Consists of dense collagen type 1 fibres and fibroblasts (tenocytes)