Circulatory System

What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

Tags

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Arteries carry oxygen rich blood away from the heart.

• True

• False

Veins carry oxygen poor blood 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.

Tags

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

• head

• fist

• hand

• foot

______________ are the smallest blood vessels.

• Arteries
• Veins
• Capillaries

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

• respiratory
• digestive
• muscular
• skeletal

Tags

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

• respiratory 
• digestive
• skeletal
• nervous

Tags

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The main function of the circulatory system is 

• To give the body structure and support
• Excrete waste
• transport blood, nutrients, and gases throughout the body
• to transport messages from the body to the brain

White blood cells

• allow for gases to exchange
• give blood its color
• fight infection and disease
• help clot blood