Muscles

Question 1

Muscles

Answer 1

Contractile organ that can produce movement over a joint.

• Insertion – Distal attachment
• Moveable attachments

Question 2

Origin-

Answer 2

Proximal attachment

More stable

Question 3

Insertion

Answer 3

Distal attachment

Moveable attachments

Question 4

Muscle Insertion Actions

Answer 4

Traditional Action – distal attachment moves towards the proximal attachment – FOCUS for this class

Reverse Action- proximal attachment moves towards distal attachment – we will talk about a few but we will use this more in Kinesiology

Question 5

Agonist

Answer 5

Prime mover

Primary muscle performing the action

Question 6

Antagonist

Answer 6

Performs action opposite to agonist

Relaxes and agonist contracts or lengthens

Question 7

Isometric

Answer 7

same length – contraction of agonists and antagonists so there is tension in muscle but no movement

Question 8

Concentric

Answer 8

shortening contraction of the muscle

Question 9

Eccentric

Answer 9

lengthening contraction usually to control movements against gravity. For example slowly lower arm down from flexed position

Question 10

Muscle Fiber Orientation

Answer 10

The action of the muscle can be determined by the direction of the fibers.

Question 11

Tendon

Answer 11

which is a highly organized dense connective tissue of collagen fibers which attaches muscle to bone

Question 12

Ligaments

Answer 12

attach bone to bone and provide stability to the joint

Question 13

Attachments

Answer 13

the muscle name is the origin and insertion of the muscle
•Example – Brachioradialis
•Coracobrachialis

Question 14

Function

Answer 14

Extensor digitorum communis – common extensor of the digits

Question 15

Appearance

Answer 15

Rhomboid major – shaped like a rhombus and is large

Question 16

Combination

Answer 16

function and appearance
•Pronator quadratus – pronator of the forearm and quadrate (square) in shape