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AQA GCSE 9-1 Biology Organising Animals and Plants topic summary
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A summary of the AQA GCSE Biology specification for the Organising Animal and Plants topic.
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Blood is a unique tissue, based on a liquid called Blood flows around the body inplasma. Plasma carries red blood cells, white blood vessels. The main type of
blood cells, and platelets. vessels are arteries, veins, and
capillaries.
PLATELETS: Small fragments of cells, with no
nucleus. They help to clot the wound sites, to stop Substances diffuse in and out of
excessive loss of blood. the blood in the capillaries.
The blood, blood vessels and heart make up the Valves are used in veins to help
human circulatory system, which transports prevent backflow, ensuring blood
substances to and from the body cells. flows in the right direction.
Plasma has white blood cells suspended in it, and Organising animals and
transports proteins and other chemicals around plants. Stents can be
the body. Statins reduce cholesterol levels in the blood, used to keep
reducing the risk of coronary heart disease. narrow or
Red blood cells contain haemoglobin that binds to blocked arteries
oxygen to transport it from the lungs to the open.
tissues.
White blood cells help to protect the body against
infection
There are more red blood cells in your body than
any other blood cell, about 5 million per mm³.
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