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CIRCULATORY SYSTEM (Blood (Main functions (distributing heat and…
CIRCULATORY SYSTEM
Blood
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Plasma
91% water, est made up of glucose, amino acids , lipids and ions ,,, contains 3% of oxygen
RBC
live for about 120 days, contains 97% of oxygen in form of oxyhaemoglobin.
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WBC
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can remove dead or injured cells and invading micro organisms., can live for a few mins during an infection or years when infection is not present.
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Main functions
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transporting chemical messengers, called hormones, to the cells
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clotting when vessels are damaged, thus preventing blood loss.
Lymphatic Function
Function
to collect some of the fluid that escapes from the blood capillaries and return it to the circulatory system
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Vessels
lymph's' are fluids that leaked due to high pressure in the blood, the excess fluid in the tissues is then returned to the blood via lymphatic system.
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Nodes
found in neck, armpits, groin and around the alimentary canal
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non-specific defence
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larger particles are trapped in the mesh work of fibres as the lymph flow through the spaces in the nodes
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