Blood transports materials and heat around the body, and helps to protect against disease. It contains:
Plasma is a straw-coloured liquid that makes up just over half the volume of blood.
This table explains the functions of various blood components.
|Plasma||Transporting carbon dioxide, digested food, urea, hormones and heat|
|Red blood cells||Transporting oxygen|
|White blood cells||Ingesting pathogens and producing antibodies|
|Platelets||Involved in blood clotting|