Energizer : Do the Gangnam Style!

Introduction

The muscular system is the fleshy covering of the body. The body has more than 700 muscles that give it form and shape. All body movements are controlled by the muscles which work by pulling against the skeleton. Muscles in the body are responsible for moving bones, pumping blood, moving food through digestive system, and controlling air movement in and out of the lungs.

Voluntary muscles or skeletal muscles that

are attached to your bones so that you can

control some of your body parts.

Involuntary muscles or smooth muscles

are muscles that you can’t move like the

stomach and the intestine in the digestive

system. Cardiac muscles are specialized

involuntary muscles that are responsible

for the heart.

A muscle cell is more commonly called muscle fiber. A muscle fiber is a bundle of longitudinally arranged myofibrils, which are composed of thin and thick muscle filaments. Thin filaments consists two actin strands and one regulatory protein while think filaments are composed of myosin molecules. These strands are responsible for striated the appearance of the muscle cells.

Anatomy

Frontalis- is thin, of

a quadrilateral

form, and

intimately adherent

to the superficial

fascia.

Trapezius- is a

flat, triangular

muscle that

covers the back

of the neck,

shoulders and

thorax.

Deltoid- is the

triangular

muscle of the

shoulder that

forms the

rounded flesh of

the outer part of

the upper arm.

Pectoralis

Major- is a large

muscle in the

chest, fanning

across the

chest from

the shoulder to

the breastbone.

Triceps Brachii-

the large muscle

at the back of

your upper arm

Biceps

Brachii- the

large muscle

at the front

of your

upper arm

Latissimus Dorsi-

is the larger, flat,

dorso-lateral

muscle on the

trunk, posterior to

the arm, and

partly covered by

the trapezius on

its median dorsal

region.

Abdominal

Muscles- are

flat muscles

that are

located at the

abdomen.

Gluteus Maximus-

is the largest

muscle in the

body that forms

the bulk of the

buttock on each

side.

Sartorius- the

longest muscle

in the human

body – is a

long thin

muscle that

runs down the

length of the

thigh.

Biceps Femoris-

located on the back

of the thigh

originates at the

buttocks and extends

to an insertion point

at the back of the

knee.

Rectus Femoris-

is connected to

the hip, and

helps extend or

raise the knee.

Gastrocnemius

- is a very

powerful

superficial

pennate

muscle that is

in the back part

of the lower

leg.

Achilles

Tendon- is a

tendon of the

posterior leg.

Physiology:

Frontalis- is to help an

individual lift his or her

eyebrows up, especially when a

person is looking up. It also

helps an individual adjust his or

her vision when the view is too

dim or distant.

Trapezius- is to stabilize the

shoulder blade, provide a

base for the movements of

the arm, and to create the

shoulder girdle for stability to

the upper body.

Deltoid- is used in all side

lifting movements and any

movement of the humerus

on the scapula.

Pectoralis Major- flexes

and rotates the humerus

and it keeps the arm

attached to the trunk of

the body

Triceps Brachii- allows for

extension and retraction.

Biceps Brachii- allows for

extension and retraction.

Latissimus Dorsi- has a synergistic role in

extension and lateral flexion of the

lumbar spine.

Abdominal Muscles- provide movement

and support to the trunk and assist in the

breathing process, these muscles serve as

protection for the inner organs ,and they

provide postural support and are important

in defining the form.

Gluteus Maximus- are responsible

for extension, abduction, lateral

rotation and slight medical rotation

of the hip joint.

Sartorius- helps to flex the lower

leg.

Biceps Femoris- allows you to jump higher

as it extends the thighs and hip movement.

Rectus Femoris- used to contract the

thigh.

Gastrocnemius- helps you point your toe

by pulling on your heel.

Achilles Tendon- connects

the large muscles in the

back of the lower leg.

How does the system work

Muscles work by contracting.

They contract to move the body.

They can only pull. They cannot

push. When a muscle contracts, it

becomes shorter and thicker so it

pulls a bone, making the bone

move. This results in the movement

of a body part.

Evaluation:

1) In what way does the muscles do in order for the body to move?

2) What is the muscle that is located at the front of the upper arm?

3) What is the muscle that is located at the back of the upper arm?

4) ______ is commonly named for muscle cell.

5) These are composed of thick and thin muscles filaments.