Blood is made up of plasma, red blood cells, white blood cells and platelets
Plasma
is a yelowish liquid which is 90% water. It carries the nutients and waste products
Red blood cells
give blood its colour. They carry oxygen and carbon dioxide
White blood cells
fight infection. They surround and absorbe germs which enters the body
Platelets
When the body is losing blood because of a cut in the skin, join together and helps stop the bleeding
Blood is transported through three types of blood vessels
Arteries
Carry blood from the heart to the rest of the body.This blood contains oxygen.
Veins
Carry the blood back to the heart. This blood contains carbón dióxido
Capillaries
Are tiny blood vessels which connect the arteries and the veins. They have very thin walls so gases and nutrientes can easily pass through them to the vells