Chapter 10

Question 1

Class 1 Lever

Answer 1

Question 2

Class 2 Lever

Answer 2

Question 3

Class 3 Lever

Answer 3

Question 4

2nd Class lever Joint

Answer 4

Question 5

3rd class lever joint

Answer 5

Question 6

1st class lever joint

Answer 6

Question 7

agonist

Answer 7

muscles causes a movement to occur through its own contraction

For example, the triceps brachii does during the up phase of a push-up (elbow extension)

Agonists are also referred to, interchangeably, as “prime movers”, since they are the muscles being considered that are primarily responsible for generating a specific movement

Question 8

Antagonist

Answer 8

Antagonist muscles oppose a specific movement. This controls a motion, slows it down, and returns a limb to its initial position. Antagonism is not an intrinsic property. It is a role, played depending on the motion. If the motion is reversed, agonist and antagonist swich roles. A flexor muscle is always flexor. But in flexion, it is always agonist and in extension, it is always antagonist. An extensor muscle is agonist in extension and antagonist in flexion.

Question 9

synergist

Answer 9

Synergist muscles performs, or helps perform, the same set of joint motion as the agonists. Synergists muscles act on movable joints. Synergists are sometimes referred to as “neutralizers” because they help cancel out, or neutralize, extra motion from the agonists to make sure that the force generated works within the desired plane of motion.

Also called Fixators