SAC REVISION

Question 1

what is an isometric action?

Answer 1

a muscle action where there is no change in muscle length and no joint movement occurs

Question 2

isoinertial actions

Answer 2

most common in physical activity, sport and exercise

• when a muscle action produces movement of the skeleton by either shortening or lengthening the muscle, tension is developed

-this muscle action is dynamic as it causes movement of a body part or limb

• there are two types of dynamic actions: eccentric/concentric

Question 3

concentric action?

Answer 3

-produces tension while shortening

• the points of attachment (origin and insertion) come closer together

Question 4

eccentric action?

Answer 4

• produces tension while lengthening
• the points of attachment (origin and insertion) move further apart.

Question 5

what are the three types of pennate muscles

Answer 5

• Unipennate
• Bipennate
• Multipennate