The Heart and Circulatory System

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The Heart and Circulatory System

• 1st Year Science

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True or False?
Capillaries have very thick walls
Arteries carry blood from the heart
Capillaries connect arteries and veins
Veins carry blood towards the heart
Veins have no valves
Arteries carry de-oxygenated blood
Arteries carry oxygenated blood
Capillaries have valves to prevent the backflow
of blood
Veins have a large space inside
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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!

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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

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http//www.bbc.co.uk/scotland/education/bitesize/s
tandard/biology/the_body_in_action/the_need_for_en
ergy_rev6.shtml
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