The Heart and Circulatory System

1st Year Science

True or False?

Arteries carry blood from the heart

Arteries carry oxygenated blood

Capillaries connect arteries and veins

Capillaries have very thick walls

Veins have no valves

Capillaries have valves to prevent the backflow of blood

Veins have a large space inside

Arteries carry de-oxygenated blood

Veins carry blood towards the heart

What does the heart do?

• The heart is a muscle that pumps blood around the body

• It pumps oxygenated blood from the lungs around the body

• It pumps deoxygenated blood from the body back to the lungs

Now look at the heart animation!

Looking at the heart…..

• The right side of my heart pumps blood to my lungs

• The left side of my heart pumps blood to the rest of my body

• The heart contains four valves to stop the backflow of blood

http://www.bbc.co.uk/scotland/education/bitesize/standard/biology/the_body_in_action/the_need_for_energy_rev6.shtml

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