The Skeletal System

How many bones do you have?

• A baby has between 300-350 bones.

• Some bones fuse together, so an adult has about 206 bones.

Largest and smallest bones

femur stapes

What do your bones do?

Support. They support your body.Protection. Bones protect internal organs.Movement. Bones enable body movements.Mineral storage. Blood cell production. Bones make blood cells in marrow.Energy storage. Some fats are stored in bones.

Joints are the places where your bones meet.

We need to take care of our joints or we will get arthritis or other problems.

cartilage

It connects bones.

It is softer than bone.

It acts like a cushion.

Your ears are made of cartilage.

Arthritisภาวะข้�อต่ออกเสบ

To prevent arthritis, we should control our weight, exercise, eat fish, prevent injury and protect our joints by being careful when lifting heavy things.

ligaments

Ligaments connect bone to bone.

Bone marrow

Bone marrow makes red blood cells.

Yellow marrow is mostly fat.

Red marrow makes blood.

We can eat bone marrow.

fracture

A fracture is a broken bone.

It is very painful.

If you fracture a bone, you will probably get a fever.

Have you ever broken a bone?

I broke my collarbone when I was 13 years old.

An x-ray can see broken bones.

spine

The spine is made of bones called vertebrae.

Your spinal cord is in your spine.

skull

Your skull protects your brain.

ribs

Your ribs protect your organs.

Bones need calcium

We should eat healthy food with calcium, or our bones may become weak.

The Skeleton Dance

scoliosis

Scoliosis is when the spine is crooked.

Syphilis destroys your bones

Syphilis is a sexually transmitted disease.

Joseph Merrick- The elephant man

He lived in the 19th century.

People paid money to see him.

Sometimes bones become fossils

Archaeologists study fossils to learn about our past.

Questions

• What bone protects our brain?• What bones protect our organs?• What nutrient do our bones need to be strong?• About how many bones are there in an adult’s body?• What is it called when we break a bone?• What is inside our bones that makes red blood cells?• What connects bones to other bones?• What health problem do we have when our cartilage

wears away?• What are the places where our bones meet?