THE HUMAN BLOOD
The average person contains same amount of blood as 5-6 litre
Composition of blood
Plasma
• Yellow liquid in our blood •Functions:
i) Transport nutrients and waste
ii) distribute enzyme, antibodies & heat energy 90% is water and included dissolved substances that is: Nutrients Proteins Inorganic ion
RED BLOOD CELLS
1. Biconcave 2. Discshaped cells 3. Without nucleus
RED BLOOD CELLS
FUNCTIONS: Transport oxygen and carbon dioxide PRODUCE AT: Bone marrow
LIFE SPAN: 120 days
DESTROYED AT: liver and spleen
WHITE BLOOD CELLS
FUNCTION: Body’s defence against desease
PLATELETS
Produce in the bone marrow Structure: tiny oval-shape without nucleus Function : play an important role in blood clotting
White blood cells