A&P - Chapter 15 (Part 1)

Question 1

How many skeletal muscles are there in our body?

Answer 1

600

Question 2

What percentage of our body weight is skeletal muscle?

Answer 2

40%-50%

Question 3

What do muscles fill?

Answer 3

In the form and contour of the body

Question 4

What are 3 skeletal muscle structures?

Answer 4

1. Endomysium
2. Perimysium
3. Epimysium

Question 5

Endomysium

Answer 5

Delicate connective tissue membrane that covers the skeletal muscle fibres

Question 6

What another word for muscle fibres?

Answer 6

Muscle cells

Question 7

Perimysium

Answer 7

Tough connective tissue membrane that binds fascicles together

Question 8

Fascicles

Answer 8

Group of skeletal muscle fibres

Question 9

Epimysium

Answer 9

Coarse sheath that covers the muscle as a whole

Question 10

What is the result of the endomysium, perimysium and epimysium fusing together?

Answer 10

Tendons

Question 11

Tendons

Answer 11

Strong, tough fibrous cords that connect muscle to bone

Question 12

Aponeurosis

Answer 12

A broad sheet of connective tissue which is an extension of the epimysium

Question 13

What characteristics do tendons and aponeurosis share?

Answer 13

They are very strong

- can break bones (not torn by traumas though)

Question 14

Origin

Answer 14

Point of attachment to the bone that remains relatively fixed when movement at the joint occurs

Question 15

Insertion

Answer 15

Point of attachment to the bone that moves when a muscle contracts

Question 16

Body of muscle

Answer 16

Main part of the muscle

Question 17

How are most body movements produced?

Answer 17

By the coordination action of groups of muscle

- some are relaxed while others contract

Question 18

What are the 4 main muscles involved in muscle actions?

Answer 18

1. Prime mover
2. Synergist
3. Antagonist
4. Fixator

Question 19

What is another word for prime mover?

Answer 19

Agonist

Question 20

Prime mover

Answer 20

Its contraction is mainly responsibly for producing a movement

Question 21

Synergist

Answer 21

Its contraction helps the prime mover to produce a movement

Question 22

Antagonist

Answer 22

Its actions oppose the action of a prime mover in a movement

Question 23

Fixator

Answer 23

Functions as a joint stabilizer

Question 24

What is an example of a prime mover in the arm?

Answer 24

Biceps

Question 25

What is an example of a synergist in the arm?

Answer 25

Brachialis

Question 26

What is an example of an antagonist in the arm?

Answer 26

Triceps

Question 27

What is the result of a fight between the agonist and antagonist?

Answer 27

Broken bone