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Components of Blood (CIE IGCSE Biology: Co-ordinated Sciences (Double Award))
Revision Note
Components of Blood
- Blood consists of red blood cells, white blood cells, platelets and plasma
Composition of human blood
Components of the Blood Table
Identifying Red & White Blood Cells
- You need to be able to identify red and white blood cells in photomicrographs and diagrams
- Red blood cells have a concave disc shape with no nucleus
- White blood cells are usually round in shape with a nucleus
Blood micrograph
Components of Blood: Function
- Plasma is important for the transport of carbon dioxide, digested food (nutrients), urea, mineral ions, hormones and heat energy
- Red blood cells transport oxygen around the body from the lungs to cells which require it for aerobic respiration
- They carry the oxygen in the form of oxyhaemoglobin
- White blood cells defend the body against infection by pathogens by carrying out phagocytosis and antibody production
- Platelets are involved in helping the blood to clot
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