5th Grade Science Muscular-Skeletal System

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Skeletal and Muscular System - 5th Grade Science

It draws the arm forward and across the chest; and rotates inwards. This muscle helps move the rib cage during heavy breathing.

pectoral muscle

These muscles help form and move the chest wall; turns upper body and catches breath.

intercostals

This muscle's function is to move the jaw up and down.

masseter

These muscles flex the thighs and hip, and extends the legs; straightens the knees.

quadriceps

This muscle flex and rotate/turn the head.

sternomastoid

This muscle rotates the hip externally and internally abducts the hip; rotates thigh.

sartorius

This muscle raises the upper arm.

deltoid

These muscles help straighten the arm.

triceps

This muscle allows the bones to move; bends arm.

biceps

This muscle makes up a large portion of the shape and appearance of the buttocks; straightens hip.

gluteus maximus

Two basic groups of muscles.

voluntary and involuntary

Muscles that help you move when you want to; you can control.

voluntary; skeletal muscles

Why aren't all your body muscles voluntary muscles?

You would have to think about everything you did, including making your heart beat, breathing, and moving food through the digestive system.

Your eyelid muscles can classified as voluntary and involuntary because

most of the time you do not control blinking, but you can if you want to.

Muscles that could be described as striped sausages.

skeletal or striated muscles

The only place where cardiac muscle can be found.

your heart

Three main jobs of the skeletal system.

1) to shape and support your body 2)to protect the organs 3)to work with the muscular system

Two minor jobs of the skeletal system.

1) making the blood cells 2)a warehouse for fat cells, calcium, and other minerals

How many bones are in an adult human body?

206 bones

Two minerals in the bones.

Calcium and Phosphorus

The four layers of the bone.

1)periosteum 2)compact bone 3)spongy bone 4)marrow

What does red and yellow marrow do?

Red marrow produces red blood cells. Yellow marrow stores the fat cells.

Four types of bone.

1)flat bone 2)short bone 3)long bone 4)irregular bone

What connects a bone to another bone?

A ligament connects bones to bones.

Cartilage has 3 jobs.

Cartilage protects bones; provides flexibility; gives body shape.

Where can you find cartilage?

1)tip of the nose 2)top of the ears 3)ends of the bones

What is a joint?

A joint is where two bones meet or where cartilage and bone meet.

Five kinds of joints.

1] pivot 2]ball & socket 3]hinged 4]fixed-skull 5]gliding

Bone fracture

greenstick little break

Bone fracture simple

bone becomes into two

Bone fracture compound

a break through the skin

Involuntary muscles have movements

you can't control; smooth muscle

Tendons are stretchy connective tissue

that attach muscles to bones.

hypertrophy

A condition in which the muscles increase in size from being used too much.

atrophy

A condition in which muscles reduce in size from lack of use.

muscle tone

the way that our muscles look and work; good muscle tone is developed by using muscles properly.

cramp

a painful muscle contraction

tetanus

a severe type of muscle contraction; persistant contraction that won't quit

spasm

an involuntary contraction of a muscle

epilepsy

very severe muscle spasms; an epileptic seizure may lead to convulsions.

hernia

when a muscle pushes through into another area when it's not supposed to be; blood does not flow normally

femur

The largest and strongest bone in the body; situated between the pelvis and the knee.

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