Download THE MUSCULAR SYSTEM

SUPPORT AND MOVEMENT
• Human body has a total of 206 bones
• There are a total of 22 bones in the skull
alone
• In the ear, there are three bones which are
the smallest in the body. About 2cm long
• Common names of bones are different than
the medical names
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Bones
Made of cells
Reproduce
grow
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Most bones are made of 6 tissues
Cartilage--- tough flexible tissue
Cushions where bones come together
Ex. Ears and the tip of your nose
• Outer membrane
• Contains nerves, blood vessels, supply bone
with blood
• This is the area that gets bruised
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Solid bone
Compact hard part of bone
Found along the edges
Stores calcium
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Spongy bone
Contains empty spaces
Found towards the ends
Gives bone strength
Stores calcium but is lightweight
• Marrow--- produces blood cells, and
platelets
• Ligaments--- tough fiber that hold one bone
to another, found at bone joints
• A joint is a place where bones come
together
• 3 types
• Hinge- moves only back and forth
• Knee, elbow, jaw
• Ball and socket- twists, turns/circle
– Shoulder
– Fixed joints—does not move (skull)
– Gliding joint---wrist
Role of Muscles
• A muscle is a body tissue that can change
shape, size to cause movement
• Located in the heart, stomach, intestines,
legs, arms
• 3 Types