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What is the blood made of?
The blood is made up of:
· Red blood cells
These make up 40-45% of the blood and give it the red colour. Their
function is to carry oxygen from the lungs throughout the body.
· White blood cells
Their job is to fight infection and there are three different types:
granulocytes, lymphocytes, and monocytes.
· Platelets
These cells help blood to clot, they clump together to form a clot or
These cells are transported by Plasma. Plasma also transports
hormones, nutrients, clotting agents and waste products that need to
exit the body.…read more

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These cells contain a molecule called haemoglobin that carries the
oxygen. These molecules loosely bind with the oxygen that is in the
lungs. The blood carries the molecules through the capillaries where
there is little oxygen and the haemoglobin sheds the oxygen
allowing the bodies cells to absorb it.
White Blood Cells
There are three different types of Granulocytes: neutrophils,
eosinophils, and basophils.
· These kill invading bacteria by ingesting them and then digesting
· These kill parasites and are involved with allergic reactions.
· These are also involved with allergic reactions.
There are two different types of lymphocytes: T cells and B
· These produce antibodies which destroy foreign bodies.
· These direct the activity of the immune system.
Monocytes enter body tissue and turn into cells called macrophages
and eat foreign bacteria and destroys damaged and dead cells of
the body.…read more

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Blood Vessels
Arteries Capillaries Veins
These carry large quantities These are very narrow; they The de-oxygenated and
of oxygen rich blood that the are so thin that oxygen and waste-laden blood passes
heart pumps to the rest of carbon dioxide can pass into the veins to return to
the body. They are wide and through them. The walls are the heart. There are three
thick because of the high made up of overlapping layers in the vein walls but
pressure from the beating of cells called endothelium, they are thin because the
the heart. There are three The red blood cells release blood isn't under a lot of
layers in the artery walls their oxygen in the pressure.
and the muscles in the capillaries which then The veins contain one way
middle layer help the heart passes through the walls valves to keep the blood
pump the blood by and into surrounding tissue. flowing toward the heart so
squeezing down to move This tissue releases waste that it is going against the
the blood along. products which are passed pull of gravity.
through the walls to the red
blood cells.…read more


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