Muscle Work

Question 1

What does a muscle need in order for a contraction to take place?

Answer 1

Must be stimulated by a nerve impulse.

Question 2

What is the all or none law?

Answer 2

A motor unit will contract maximally or not at all depending on whether the motor units threshold is stimulated.

Question 3

Group muscle action is divided into which two areas?

Answer 3

Agonist.

Antagonist.

Question 4

Define Agonists?

Answer 4

Muscle groups working together to produce a movement.

Question 5

Define Antagonists?

Answer 5

Muscle groups acting on the opposite side of the joint.

Question 6

Define an Isometric Contraction?

Answer 6

Increased tension at the muscle but with no change to the angle at the joint.

I.e Static Contraction.

Question 7

Define an Isotonic Contraction?

Answer 7

Increased tension at the muscle causing it to shorten (concentric) or lengthen (eccentric) to overcome or control a resistance.

I.e Dynamic contraction.

Question 8

Define an Isokinetic Contraction?

Answer 8

Contracting the muscle against a variable resistance at a constant speed.