BLOOD

Composition of Blood

• Erythrocytes = carry oxygen and some carbon dioxide (red blood cells)
• Lymphocytes = T-types cells destroy viruses and cancer cells
• Neutrophils = B-type cells produce antibodies
• Monocytes = remove dead cells and bacteria
• Platelets = triggers blood clotting
• Plasma = 90% water and transports dissolved substances

Functions of Blood

• Transport = Blood carries elements required for life around the body, such as: carbon dioxide, oxygen and insulin and adrenalin. The red blood cells are a disc shape to carry the maximum amount of haemoglobin
• Temperature regulation = Our optimum temperature of 37 degrees is maintained by chemical reactions regulated by enzymes
• Exchange of materials with body tissues
• Preventing infection = Leucocytes, neutrophils and b-type cells detect threats or pathogens and act like antigens to destroy bacteria
• Blood clotting = When exposed to oxygen or foreign material, platelets activate a chain reaction called coagulation

Types, structure, and functions of blood vessels

• Arteries = Carry oxygen-rich blood away from the heart and around the body (apart from the pulmonary artery). The walls contain several layers of thick…