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Muscular System
| Question | Answer |
|---|---|
| What are the main functions of the muscular system? | Maintain posture, produce heat, produce movement, regulate organ volume, stabilize joints |
| 4 characteristics of muscle tissue. | Extensibility, excitability, elasticity, contractility |
| Origin | Spot where a muscle attaches to an immovable bone |
| Insertion | Spot where a muscle usually attaches to a movable bone |
| Tendon | Strong fibers that connect muscle to bone |
| What are the three types of muscle | Smooth, Cardiac, and Skeletal |
| Smooth | Nonstriated, 1 nucleus per muscle cell, and involuntary. Usually found on organs and blood vessels. Steady contractions. |
| Cardiac | Striated, 1 central nucleus per muscle cell, and involuntary. Only found on the heart and has slow and steady contractions. |
| Skeletal | Striated, multi-nucleated, voluntary. Found on the surface of bones and is not rhythmic. |
| Roles of muscles | Agonist, Antagonist, Synergist, Fixator |
| Agonist | Prime mover of muscle |
| Antagonist | Does the opposite of the agonist |
| Synergist | Assists the agonist, provides additional force |
| Fixator | Stabilizes the point or body position |
| Myofibril | Any of elongated contractile threads found on the surface of striated muscle cells |
| Myofilament | Thread-like structure found on the inside of muscle cells. (muscle fiber) |
| Sacromere | segment that allows the muscle to contract consisting of actin, myosin. |
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