Chapter 4: Joints and Muscles

Voluntary

Strong

Involuntary

Intelligent

elbow, shoulder, knee

heart, lungs, liver

fibia, sternum, scapula

The model shows how the spine can bend and straighten.

The model shows the largest bone in the skeletal system.

The model shows cartilage cushioning the vertebrae in the spinal column.

Muscles

Bones

Organs

Knee

Cranium

Heel

Sternum

Safe from harm, protected

Very clever

weak, in danger

She took her son and dipped him in the river.

So this heel never got dipped in the river.

Nothing could harm him - or so she thought.

When Achilles was a baby, his mom tried to make sure that he would never die.

Joints are cushioned by cartilage and join two bones together. Tendons connect muscles to bones.

There is cartilage between each of the thirty vertebrae in our spinal column.