| A | B |
|---|
| voluntary muscles | These muscles are under you control` |
| involuntary muscles | These muscles you can't consciously control (eg. digestive tract, heart, etc.) |
| skeletal muscles | These muscles are responsible for voluntary movement (generally attached to bone) |
| muscle fiber | This is another name for muscle cells |
| smooth muscles | These muscles are involuntary muscles. They are spindle-shaped and have individual nuclei, and are not striated |
| cardiac muscle | This type of muscle in found only in the heart |
| tendons | These attach muscles to bone |
| origin | This is the point where the muscle attaches to the immovable bone |
| insertion | This is where the muscle attaches to the movable bone |
| contraction | Muscles function by __________. |
