Lecture 10: Musculoskeletal system

Question 1

What is concentric?

Answer 1

Muscles are active, which develops tension - this burns a lot of energy. The muscle shortens.

Question 2

What is Eccentric

Answer 2

The muscle is active and still develops tension, however the tension is lesser than the load - as the muscle elongates.

It is pulled in opposite direction by another muscle/gravity.

Question 3

What is Isometric?

Answer 3

The muscle is active and develops tension, the tension does not outweigh the load, there is no change in joint position or in length of muscle.

Question 4

what is the role of Agonists

Answer 4

Agonists act concentrically to create a movement at a joint. An example is the biceps branchii shortens.

Question 5

What is the role of antagonists

Answer 5

They act eccentrically to oppose and control the movement. e.g. triceps brachii lengthens

Question 6

what is the role of stabilisers and neutralisers

Answer 6

stabilisers hold a joint still, prevents movement of that specific joint

Neutralisers eliminate an unwanted movement caused by another muscle. This can be drinking from a glass, not wanting to supinate or else the glass would fall, therefore the neutraliser stops that.