The Circulatory System

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Author:
crobertsonx
ID:
78039
Filename:
The Circulatory System
Updated:
2011-04-07 07:15:25
Tags:
crobertsonx biology circulatory system
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Description:
Biology, Subtopic, The Body in Need
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  1. Substances like ____, ______ and ________ are carried around the body by the circulatory system. This consists of the _____ which pumps the blood and the blood vessels which carry the blood
    • food
    • oxygen
    • carbon dioxide
    • heart
  2. the right atrium receives blood from the body via the ____ ____
    vena cava
  3. the right ventricle pumps blood out into
    the ________ _____ which carries it to the lungs
    pulmonary artery
  4. the left atrium receives blood from the lungs via the ________ ____
    pulmonary vein
  5. the left ventricle pumps blood out into the ____ which carries blood around the body.
    aorta
  6. The heart is a _________ ____
    muscular pump
  7. The heart muscles work by _________ and ________ again and again.
    • contracting
    • relaxing
  8. to ensure that blood does not flow backwards as the heart beats ______ are present in the heart
    valves
  9. Valves prevent
    the backflow of blood
  10. The wall of the left ventricle is _______ than the wall of the right ventricle because the left ventricle has to pump blood all round the body. The right ventricle only has to pump blood to the _____.
    • thicker
    • lungs
  11. The heart’s blood supply is made up of ________ ______ and ________ ____
    • coronary arteries
    • coronary veins
  12. arteries
    which carry blood away from the heart
  13. capillaries
    which are tiny vessels whose walls are one-cell thick
  14. veins
    which carry blood back to the heart
  15. When we feel a _____ in our wrist or neck it indicates that blood is flowing through an ______.
    • pulse
    • artery
  16. Blood consists of _____ _____ and ______ ______
    • blood cells
    • liquid plasma
  17. Red blood cells transport ______ around the body
    oxygen
  18. Plasma transports _________ _____ and ______ ______
    • dissolved foods
    • carbon dioxide
  19. Red blood cells are red because they contain a red pigment called ___________
    haemoglobin
  20. haemoglobin carries ______ around the body from the _____ to all of the _____ ____
    • oxygen
    • lungs
    • bodys cell
  21. In the lungs haemoglobin combines with oxygen to form _______________
    oxyhaemoglobin
  22. When the blood reaches the body’s cells the oxyhaemoglobin breaks down again to ______ and ___________.
    • oxygen
    • haemoglobin
  23. The cells of our bodies are constantly using up ______ and producing _______
    • oxygen
    • carbon dioxide
  24. Gas exchange between the blood and the cells of the body takes place when __________ come into close contact with the _____. ______ passes from the blood into the cells. ______ passes from the cells into the blood.
    • capillaries
    • cells
    • oxygen
    • carbon dioxide
  25. exchange occurs very _______ and _________ between blood and the body cells
    • quickly
    • efficiently
  26. a capillary network has a _____ _______ ____, which means that every body cell is close to a capillary
    large surface area
  27. in a capillary network, capillary walls are only ___ ____ thick.
    one cell

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