2.2 Muscle Contractions

What are the two things that are essential for bones to move?

1) the joints that connect them

2) the muscles that stretch over those joints

Movement occurs when muscles do what?

contract

What do muscles always do?

pull

What do muscles never do?

push

What are the two types of contractions?

isotonic & isometric

What are isotonic contraction?

cause a change in the length of muscles

What are two examples of isotonic contractions?

lifting a box & doing push-ups

What are isometric contractions?

no change in the length of muscles

What are two examples of isometric contractions?

standing with good posture & doing a plank

What is insertion in terms of muscle contractions?

the moveable bone during muscle contraction

What is origin in terms of muscle contractions?

the bone that moves less or not at all

In a bicep curl when the radius pulls towards the scapula, is the radius the insertion point or the origin?

insertion point

In a bicep curl when the radius pulls towards the scapula, is the scapula the insertion point or the origin?

origin