(AQA GCSE B3.2.1) The Heart and Circulation

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  • Created by: Em
  • Created on: 17-04-13 19:42
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  • The Heart and Circulation
    • Coronary arteries are blood vessels which deliver blood to the heart and muscles with oxygen and sugars. It is also here that heart attacks occur.
      • Heart disease is when these arteries are blocked by cholesterol.
        • Stents can be used to widen the blocked arteries. Tube-shaped wire mesh, insert and open up inside artery, restoring blood flow.
    • Remember, RIGHT and LEFT of heart on diagrams are opposite. For example on an image, the right ventricle would actually be on the left-hand side as you look at it.
    • VEINS, ARTERIES, CAPILLARIES
      • Arteries are ROUND, and have THICK LAYER OF MUSCLE and ELASTIC TISSUE inside.
        • When the blood flows through an artery it is under a lot of pressure i.e. when oxygenated blood moves through the aorta.
      • Veins are FLATTER (less round) in shape and have THINNER WALLS with LESS MUSCLE.
      • Capillaries are very NARROW with VERY THIN WALLS so that they can penetrate deep into the tissues and supply energy to the cells and take waste products.
        • Capillaries are just wide enough to allow a single red blood cell to flow through.
  • HOW THE HEART WORKS
    • The Heart and Circulation
      • Coronary arteries are blood vessels which deliver blood to the heart and muscles with oxygen and sugars. It is also here that heart attacks occur.
        • Heart disease is when these arteries are blocked by cholesterol.
          • Stents can be used to widen the blocked arteries. Tube-shaped wire mesh, insert and open up inside artery, restoring blood flow.
      • Remember, RIGHT and LEFT of heart on diagrams are opposite. For example on an image, the right ventricle would actually be on the left-hand side as you look at it.
      • VEINS, ARTERIES, CAPILLARIES
        • Arteries are ROUND, and have THICK LAYER OF MUSCLE and ELASTIC TISSUE inside.
          • When the blood flows through an artery it is under a lot of pressure i.e. when oxygenated blood moves through the aorta.
        • Veins are FLATTER (less round) in shape and have THINNER WALLS with LESS MUSCLE.
        • Capillaries are very NARROW with VERY THIN WALLS so that they can penetrate deep into the tissues and supply energy to the cells and take waste products.
          • Capillaries are just wide enough to allow a single red blood cell to flow through.
    • Deoxygenated blood (often represented as blue) first flows into the RIGHT ATRIUM.  The walls of the right atrium CONTRACT, and push the blood into the RIGHT VENTRICLE through a valve which does not allow blood to go back on itself in the wrong direction
      • The right ventricle then contracts, pushing blood through the PULMONARY ARTERY to the LUNGS.
        • The lungs oxygenate the blood, and the blood travels through the PULMONARY VEIN to the LEFT ATRIUM. The first process repeats itself here.
          • When the left ventricle contracts, the oxygenated blood is pushed through the AORTA which is an artery.
            • The aorta then leads the blood to different parts of the body where oxygen is given to the cells for aerobic respiration.
              • Deoxygenated blood then flows through the VENA CAVA vein back to the heart to the right atrium, and the process repeats again over and over constantly.

Comments

ashma

tooooooooooooooooooooooooo heaaaaaaaaaaaash 

eyllaf

way tooo confusing

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