| A | B |
|---|
| skeletal muscle | striated, voluntary |
| smooth muscle | nonstriated, involuntary, internal organs |
| cardiac muscle | striated, branched, involuntary |
| origin | muscle attached to a fixed structure |
| insertion | muscle attached to a moveable structure |
| prime mover | movement in a single direction |
| antagonist | movement in the opposite direction |
| flexor | flexes or bends a joint |
| extensor | extends or straightens a joint |
| levator | raises a body part |
| depressor | lowers a body part |
| muscle fatigue | accumulation of lactic acid |
| muscle tone | constant slight contraction |
| isotonic | muscles shorten and contract |
| isometric | tension increases; muscles does not shorten |
| atrophy | muscles shrink from disuse |
| hypertrophy | muscle increase in size |
| frontalis | controls facial expression |
| masseter | controls mastication |
| sternocleidomastoid | moves the head |
| deltoid | moves the shoulder |
| biceps | moves the arm |
| flexor carpi | moves wrist, hand, and fingers |
| diaphragm | helps in breathing |
| rectus abdominis | compresses the abdominal cavity |
| gluteus maximus | moves the upper leg |
| sartorius | moves the lower leg |
| tibialis anterior | moves the ankle |
| peroneus longus | moves the ankle, foot, toes |
| muscle strain | tear in the muscle |
| muscle spasm | sustained contration of the muscle |
| myalgia | used to describe muscle pain |
| hernia | organ protrudes through a weak muscle wall |
| tetnus | lockjaw |
| muscular dystrophy | muscle cells deteriorate |
| shin splints | injury to the muscle tendon in front of the tibia |
| rotator cuff disease | inflammation of tendons surrounding the shoulder |
