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The smallest blood vessels with very thin walls. They join the smallest arterioles to the smallest venules and enable the exchange of water, oxygen, carbon dioxide between blood and surrounding tissues.
Red blood cells
These turn your blood red and make up 40% of the solids in a drop of blood. They are your body's main way of delivering oxygen to your body cells.
chemical messengers that travel the body via the bloodstream in order to control and coordinate complex processes, such as growth and metabolism
White blood cells
Lymphatic and immune system cells that travel throughout your body, attempting to destroy harmful bacteria and viruses
Blood clotting process
The sealing of cuts. This process keeps your blood from leaking out and helps to prevent the invasion of harmful bacteria
Special markers that are attached to your cells. The ones attached to your red blood cells determine the type of blood you have
Universal donor blood
The blood type that has neither A nor B antigens and can be given to nearly any person
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