circulatory system

What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

Arteries carry oxygen rich blood away from the heart.

• True

• False

Veins carry carbon dioxide back to the heart.

• False

• True

The job of the heart is to . . .

• pump blood around the body.

• send food to the small intestines.

• break down food.

• give energy to the body.

The heart is about the size and shape of your . . .

• head

• fist

• leg

• foot

The circulatory system works with the ___________ system to provide our body with oxygen.

• respiratory
• digestive
• muscular
• skeletal

The circulatory system works with the __________ system to obtain energy from nutrients that we eat. 

• respiratory 
• digestive
• skeletal
• nervous

The heart has ___ chambers.

• 1
• 2
• 3
• 4

PLATELETS ARE CELLS THAT

• HELP YOUR BLOOD CLOT

• CARRY OXYGEN IN THE BLOOD

• FIGHT INFECTION

• EXCHANGES GASES IN THE LUNGS

arteries, veins, and capillaries are three types of __________

• heart valves

• blood vessels

• cells

• minerals