• Transport of gases, nutrients, wastes.
• Fighting infection.
• Regulation of temperature and hydration

Adult males : 5-6 litres  /  Adult females : 4-5 litres.

Red Blood Cells (RBC)

• The most plentiful cells in our blood (≈45%)
• They contain a protein called hemoglobin that carries oxygen to our cells and transports carbon dioxide back to heart to be exhaled.
• Hemoglobin also is responsible for the colour of blood.
• Platelets are not a part of RBC but another component of blood which is responsible for clotting.

White Blood Cells (WBC)

• “Soldiers” of the blood stream
• ≈1 WBC for every 650 RBC
• Act as a defence against infection by seeking out antigens and destroying them

PLASMA

• Makes up the majority of blood
• The yellowish liquid portion of blood that contains all the blood cells.
• It transports chemicals and heat and acts as fluid for cells to travel in.
• Chemicals include; foods, hormones and wastes like carbon dioxide and urea.