platelets

• plasma is a straw colour liquid that makes up just about half of the blood volume
• the functions of plasma are:

  • transports carbon dioxide from respiring cells to lungs
  • transports digested food from small intestine to respiring cells
  • transports urea from the liver to the kidney
  • distributes heat around the body
  • transports hormones to the glands where they are made to target organs
• scabs form when blood clots form on a wound
• blood contains platelets which help clot blood and prevent blood loss
• platelets can stick together to form clumps that get stuck in mesh that is made by platelets as they release chemicals that cause soluble proteins to form mesh across the wound