Blood

• Blood


  A tissue consisting of plasma, in which the red blood cells, white blood cells and platelets are suspended
• Components of blood


  • Plasma (55%)
  • Buffy coat (<1%, white blood cells and platelets)
  • Red blood cells (45%, erythrocytes)
• Plasma


  Pale yellow fluid part of blood, transports cells, CO₂, hormones and waste
• Red blood cells (erythrocytes)


  • Have no nucleus (more room to carry O₂)
  • Contain the red pigment haemoglobin which carries O₂
• White blood cells


  Fight infection
• Platelets


  Blood clotting