Chapter 8 Muscle System

Question 1

What does striated mean ?

Answer 1

Comes from a microscopic appearance of the muscle cell, they look striped. Alternating, crosswise dark and light bands run the length of each cell.

Question 2

what gives muscle the stripped look?

Answer 2

The way the proteins Actin and Myosin line up gives this appearance.

Question 3

What is the difference between a Tendon and a aponeurosis?

Answer 3

A tendon is a continuation of the connective tissue that goes into the muscle and its distributed which allows it to contract.
Aponeurosis is the connective tissue that some muscles connect to instead of tendons. Ex: linea Alba.

Question 4

What is the origin of the muscle

Answer 4

the origin of the muscles is the part of the muscles that is most stable so it doesn’t move a lot.

Question 5

What is the insertion of the muscle

Answer 5

The insertion is the part that undergoes most of the movement when a muscle contracts.

Question 6

A muscle that shortens is:

Answer 6

A muscle that contracts

Question 7

what is exitability?

Answer 7

When a muscle can respond to a stimulation such as a nerve impulse.

Question 8

what is Contractibility?

Answer 8

when a muscle shortens in length when stimulated

Question 9

What is Extensibility ?

Answer 9

a muscle will stretch when pulled

Question 10

What is Elasticity

Answer 10

When a muscle returns to their original shape and length after contraction or extension.

Question 11

term used to describe a muscle or muscle group that directly produces a desired movement?

Answer 11

Agonist

Question 12

A muscle or muscle group that directly opposes the action of an agonist?

Answer 12

Antagonist

Question 13

Skeletal muscle that contracts at the same time as an agonist and assist it in carrying out its action?

Answer 13

Synergist

Question 14

A type of muscle that stabilizes joints to allow other movement to take place? Ex: some muscles that flex the digits also can flex the carpus or wrist

Answer 14

Fixator

Question 15

what shape is Deltoid?

Answer 15

Triangle

Question 16

Which is the muscle that allows for twitching of the skin?

Question 17

Which is the muscle that allows for twitching of the skin?

Answer 17

The Cutaneous Muscle

Question 18

Muscle responsible for chewing, located in the cheek area of the skull and its the most powerful of the chewing muscles. Its main action is to close the jaw

Answer 18

Masseter muscle

Question 19

which 2 muscles extend the head and neck, and are located on the dorsal part of the neck?

Answer 19

Splenius and Trapezius

Question 20

Which muscle can extends the head and neck and also pulls the front leg forward? It is a fairly large muscle that runs from proximal area of humerus up to the base of the skull?

Answer 20

Brachiocephalicus

Question 21

Neck flexor muscle its smaller it extends from the sternum to the base of the skull and acts to flex the head and neck?

Answer 21

Sternocephalicus muscle