Body Systems - Circulatory System

Match the following.

• the smallest of all the blood vessels

• capillaries

• veins

• carry blood back to the heart

• arteries

• carry blood away from the heart

The circulatory system has two main jobs. Select the two main jobs of the circulatory system.

• carrying oxygen and food to all the cells of the body

• carrying waste away from the cells

• bringing messages to our senses

• protecting the brain

The three main parts of the circulatory system are the heart, blood, and ​ (a)   .

• blood vessels
• brain
• spinal cord
• nerves

Arteries have ​ (a)   walls. Veins have​ (b)   walls.

• thick
• thin
• many
• no

Your heart is the size of your -

• fist

• skull

• stomach

• fingernail

The heart is like a -

• pump.

• computer.

• water hose.

• ladder.

The heart is made of -

• cardiac muscle.

• nerve cells.

• bone cells.

• skin cells.

The circulatory system carries food and (a)   to our cells and carries​ (b)   away from our cells.

• oxygen
• waste

(a)   carry blood away from your heart.​ (b)   carry blood back to your heart.

• Arteries
• Veins
• Capillaries

Capillaries are tiny blood vessels with very ______ walls.

• thin

• thick