Structure and Function of Muscular System

Question 1

Agonist Def

Answer 1

Prime Mover - Muscle doing the action

Question 2

Antagonist Def

Answer 2

Relaxed/lengthened muscle for movement.

Question 3

Fixator Def

Answer 3

A muscle that works with others to stabilise the origin of the prime mover. E.g. Trapezius contracts to stabilise the origin of the biceps

Question 4

What muscle is the agonist in shoulder abduction?

Answer 4

Deltoid (medial head)

Question 5

Is the hamstring the agonist/antagonist in knee flexion?

Answer 5

Agonist (it is performing the movement by contracting)

Question 6

Origin Def

Answer 6

End of the muscle attached to a bone that is stable (e.g the scapula). Point of origin remains still when the contraction/movement occurs

Question 7

Insertion Def

Answer 7

End of the muscle attached to the bone that actively moves (e.g the biceps insertion is on the radius)

Question 8

What are the three types of muscle?

Answer 8

Involuntary
Cardiac
Skeletal/Voluntary

Question 9

What are the main two muscle groups in the back?

Answer 9

Trapezius
Latissimus Dorsi

Question 10

Straightening of the arm at the elbow requires what muscle to contract?

Answer 10

Triceps