Circulatory System

The circulatory system

moves blood from the

heart through the body and back to the heart again.

Blood is the liquid that circulates around your body. It carries oxygen and food to body cells, and takes waste

away.

The bright red, oxygen rich blood is pumped through the left side of the heart. The purple, oxygen poor blood returns to the right

side of the heart.

The heart is the muscle behind the circulatory

system.

Your heart is the size of your fist.

It is inside the middle of your chest just to

the left.

Your heart is a powerful pump.

It tightens and relaxes about 70 times a minute to force blood through

your body.

The heart has 2 sides.

The right side pumps

blood only to the lungs.

The left side of the heart

pumps blood to the rest of the

body.

The heart pumps blood to the arteries and on to the tiny

capillaries.

Arteries are shaped like tubes and carry blood

away from the heart.

Capillaries are the smallest of all your blood vessels.

They can only be seen under a

microscope.

There are over10 billion

capillaries in your body.

The arteries and capillaries bring water, oxygen and nutrients to your cells.

The veins bring the blood back to the heart.

They bring with them toxic waste called:

CO2 or Carbon Dioxide.

Carbon dioxide makes us

sick!

But trees

l ve it!

Trees use the CO2 or Carbon Dioxide

to make food for the plant.

And in return the plants give us oxygen to

breathe.

The oxygen we breathe fills our lungs with fresh clean

oxygen rich air.

Now the purple, oxygen poor blood rushes to the lungs to

get fresh oxygen before it makes its trip around the body

once again.

Every 90 seconds the cycle repeats itself. The blood takes oxygen to the cells

and returns with the poison carbon dioxide.