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42 terms

5th Grade Science Muscular-Skeletal System

Skeletal and Muscular System - 5th Grade Science
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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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