Blood
Plasma
Blood cells
Red blood cells
Haemoglobin to carry oxygen,no nucleus,disc-shaped,made in the bone marrow
White blood cells
Fight infection, produce antibodies, nucleus present, no definite
Platelets
Blood clotting, no nucleus, fragment of cells,
Plasma
90%water, carries platelets and red and white blood cells, carries dissolve substance (10%) e.g. Glucose proteins, urea.
Function of blood
Transport
Defence against disease
Clotting
Arteries
Carry blood away from the heart
Capillaries
Connect arteries and veins
Veins
Carry blood back to the heart
Blood vessels
Arteries
Veins
Capillaries