Blood and blood vessels
Blood carries oxygen and nutrients to the cells of our body and helps us fight infection. Veins, arteries and capillaries are blood vessels that combine with the heart to make up the circulatory system.
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Topic: Blood related conditions
When a person is anaemic, the red blood cells have to work harder to get oxygen around the body.
Your body needs cholesterol, but it can make its own. You don't need cholesterol in your diet.
Long international flights are suspected of contributing to deep vein thrombosis in susceptible people.
Haemochromatosis (iron overload disorder) tends to be under-diagnosed, partly because its symptoms are similar to those caused by a range of other illnesses.
All children with severe haemophilia are given preventative treatment with infusions of blood products before they have a bleed.
Hughes syndrome is thickening of the blood caused by abnormal immune system cells.
Don't take iron supplements unless advised by your doctor.
Keep iron supplements away from children - as little as one to three grams can kill a child under six years.
Polycythaemia vera is characterised by the production of too many red blood cells, caused by abnormal function of the bone marrow.
Porphyria can affect the skin, nervous system, gastrointestinal system or all of these, depending on the specific type.
Bacteria in the bowels, urinary tract, mouth and skin can cause disease if they get into the bloodstream.
Thalassaemia is an inherited blood disorder that can cause anaemia or death if not treated.