The Circulatory System

By: Madison Reeder 6th Period 3/12/15

Components of the Circulatory System:

There are three components of the Circulatory System. They are the blood, the heart, and the blood vessels. The blood is a connective tissue made of plasma and cells. The heart is a muscular pump to move blood. And then the blood vessels which include the veins, arteries, capillaries that deliver blood to all parts of the body.

Blood Vessels:

  • Arteries- Carry oxygen-rich blood FROM HEART to the body.
  • Veins- Carry oxygen-poor blood FROM ORGANS & TISSUES to the heart.
  • Capillaries- Microscopic blood vessels located between arteries and venules.
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  • Carry blood AWAY from the heart.
  • Arterioles- smallest arteries.
  • Have thick, strong, elastic walls.
  • Carry oxygen-rich blood to ALL body cells.
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  • Carry blood TO the heart.
  • Have thin, elastic walls with valves.
  • Valves help return blood to the heart.
  • Venules- smallest veins.
  • Carry oxygen-poor blood back to the heart.
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  • Connect arteries and veins.
  • Surround EVERY cell in the body.
  • Site of GAS exchange.
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Gas Exchange:

  • Occurs between the thin walls of the alveoli and thin walls of the capillaries.
  • Capillaries make up most of the vessels inside the human body.
  • Blood vessels, heart, lungs all work together to being oxygen to body cells and remove carbon dioxide from the cells.
Circulatory System Bill Nye on the Heart (Part 1)