Circulatory System

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Author:
ellada25
ID:
55707
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Circulatory System
Updated:
2010-12-13 19:39:34
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ellada25
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Description:
SCIENCE 10
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  1. What is the circulatory system made up of?
    • heart
    • blood
    • blood vessels
  2. What is the function of the Circulatory System?
    Transports oxygen and nutrients throughout the body
  3. What are the smallest blood vessels? What is their function?
    • Capillaries
    • blood exchanges many substances with the surrounding tissue
    • blood flows into larger blood vessels (veins)
  4. What type of tissue is blood? What is it made up of?
    • connective tissue
    • red blood cells
    • white blood cells
    • platelets
    • plasma
  5. What is the function of arteries? Do they have thick walls Why or Why not?
    • carry oxygenated blood away from the heart
    • thicker walls since there is great pressure as blood is being pumped away from the heart and throughout the body
  6. What are veins? What is their function?
    • Carry deoxygenated blood towards the heart
    • lower pressure than arteries
    • largest near the heart
  7. What tissue is the heart made up of?
    • Cardiac muscle tissue
    • nerve tissue
    • connective tissue
  8. What is the special function of Cardiac Muscle Tissue?
    synchronized contractions and conducts electrical impulses even when not stimulated by a nerve impulse
  9. What factors affect heartbeat?
    • physical activity
    • stress
    • temperature
    • time of day
    • food
    • general health
  10. What are the muscles and nerves covered by? What is its function?
    • epithelial tissue
    • reduces friction
    • protects heart when lungs expand and contract
    • allows blood to flow freely
  11. How is breathing controlled? What effect does breathing have on heart rate?
    • Breathing is controlled by a part of the brain that detects the concentration of carbon dioxide in the blood. As the level of Carbon Dioxide increases, the brain sends signals to the diaphragm, the muscles between the ribs, and the heart. The breathing rate increases, and the heart beats faster.
    • This has the double effect of decreasing the concentration of Carbon Dioxide in the blood and increasing the available oxygen.
  12. What is tuberculosis? How does Bacteria enter the body? What are some general symptoms? How is it diagnosed? Fatal ?
    • infectious disease
    • bacteria enters body when you breathe
    • generals symptoms: fever cough weight loss, fatigue, chest pain.
    • disease can be fatal
    • x-ray diagnosis
  13. What happens to TB bacteria after initial contact? How is TB treated?
    • bacteria can remain dormant in the body for decades
    • treated with medicine and a few weeks of hospitalization

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