Muscle Vocab 2 Flashcards Preview

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Flashcards in Muscle Vocab 2 Deck (18):
0

Acetylcholine

The specific neurotransmitter that stimulates skeletal muscle

1

Fixators

Hold a bone still or stabilize the origin of a prime mover

2

Origin

The point at which a muscle is attached to an immovable or less movable bone

3

Synergists

Help prime movers by producing the same movements orby reducing undesirable movements

4

Action potential

An unstoppable electrical current that travels over the surface of the sarcolemma, resulting in contraction of a muscle cell

5

Muscle twitches

Single, brief, jerky contractions of muscle activity

6

Adduction

The movement of a limb toward the body midline

7

Muscle fatigue

When we exercise our muscles strenuously and a muscle is unable to contract

8

Antagonists

Muscles that oppose or reverse a movement

9

Oxygen debt

During prolonged muscle activity, body cannot take in oxygen fast enough to keep muscle cells supplied with oxygen

10

Extension

A movement that increases the angle of a joint and increases the distance between 2 bones

11

Flexion

A movement that decreases the angle of a joint and brings 2 bone together

12

Neurotransmitter

A chemical that stimulates a muscle cell

13

Circumduction

A combination of movements, commonly seen in ball and socket joints

14

Prime mover

The muscle that has the major responsibility for causing a particular movement

15

Insertion

The point at which a muscle is attached to a movable bone

16

Muscle tone

A state of continuous, partial contraction

17

Rotation

Movement of a bone around it's longitudinal axis