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carry blood AWAY from the heart

have a high amount of oxygen. have thick, strong elastic walls. Arteries. carry blood AWAY from the heart. pump less blood faster. Veins. carry blood TO the heart. have thin, elastic walls with valves. valves help veins return blood to the heart. carry more blood slower.

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carry blood AWAY from the heart

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  1. have a high amount of oxygen • have thick, strong elastic walls Arteries • carry blood AWAY from the heart • pump less blood faster

  2. Veins • carry blood TO the heart • have thin, elastic walls with valves • valves help veins return blood to the heart • carry more blood slower • have a lower amount of oxygen

  3. Capillaries • connect arteries and veins • walls of capillaries are one cell layer thick • surround every cell in the body • site of gas exchange; around air sacs (alveoli)

  4. How does the circulatory system interact with the respiratory system? The capillaries wrap around the alveoli (air sacs) and the gas exchange occurs: O2 and CO2

  5. Functions of the circulatory system: 1.Transporting oxygen, hormones, nutrients and removing carbon dioxide O2 CO2

  6. 3 major parts of the circulatory system Heart: A hollow cardiac muscle that pumps blood 60-100 beats/minute ~100,000 times per day About the size of your fist On the left side of your chest protected by the rib cage 4 chambers: right and left atria (top) right and left ventricles (bottom)

  7. Blood vessels arteries-carry blood away from the heart (usually oxygen RICH: bright red color) aorta-largest artery-oxygenated blood from heart (left ventricle) to the body veins-carry blood to the heart (usually oxygen poor: blue or purple color); have valves venules-smallest, not as small as capillaries Vena cavas-one brings blood to heart from head area and one brings blood to heart from leg area capillaries-smallest division (wrap around alveoli in lungs)

  8. Circulation of blood through the body • http://www.sciencekids.co.nz/videos/humanbody/circulatorysystem.html • Video on circulation

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