Biology-blood

• Vein


  Blood vessel that transports blood to the heart
• Veins


  Blood vessels that transport deoxygenated blood to the heart
• Pulmonary veins


  Veins that carry oxygenated blood from the lungs to the heart
• Arteries


  Blood vessels that transport oxygenated blood away from the heart
• Veins


  • Have valves that transport blood
  • Have low muscular tissue in their walls
• Arteries


  • Have more muscular tissue in their walls
  • Have a narrower lumen than veins
• Capillaries


  • The smallest branches of arteries and veins
  • Have walls that are just one cell thick
• Exchange of molecules in capillaries

  1. Oxygen diffuses from blood plasma into tissue fluid and cells

  2. Carbon dioxide diffuses from cells into tissue fluid and then into blood plasma

  3. Glucose diffuses from blood plasma into tissue fluid and then into cells
• Blood


  A liquid that consists of plasma, red blood cells, white blood cells, and platelets
• Plasma


  The straw-coloured liquid part of blood that makes up just over half the volume
• Components of blood


  • Red blood cells
  • White blood cells
  • Platelets
• Red blood cells


  • Transport oxygen
  • Contain haemoglobin
  • Have a biconcave shape
  • Have no nucleus
• White blood cells


  • Phagocytes that engulf and destroy unwanted microorganisms
  • Lymphocytes that produce antibodies
• Platelets


  • Cell fragments produced in bone marrow
  • Enable blood clotting
• Blood products are screened for infectious agents and blood group compatibility before transfusion
• Blood cells can be identified by staining techniques like Giemsa stain
• Coronary heart Disease is a non-communicable condition
• What is the shape of a red blood cell?

  Biconcave
• What are features and adaptations of red blood cells?

  No nucleus meaning more space for oxygen and haemoglobin