Blood is a complex liquid tissue. It transports oxygen, dissolved substances and heat around the body. Its also involved in immune responses., Red blood cells transport oxygen for aerobic respiration. They must be able to absorb oxygen in the lungs, pass through narrow blood vessels, and release oxygen to respiring cells., Plasma carries dissolved substances such as carbon dioxide, nutrients and urea, as well as heat, around the body., Red blood cells have a biconcave disk shape to increase their surface area., Red blood cells have no nucleus to increase the amount of haemoglobin they carry., Red blood cells are small and flexible so they can fit through cappilaries., there are two types of white blood cells. Phagocytes ingest and destroy pathogens and lymphocytes produce antibodies., Antibodies can neutralise the toxins produced by pathogens, they can also label pathogens and clump them together so there easier to destroy., Platelets release chemicals that cause soluble fibrinogen proteins to form a mesh of insoluble fibrin across the wound., Platelets and red blood cells get caught in this mesh and dry out to form a scab.,

Explaining the functions of blood

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