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Blood provides your body with circulation.

The four main things that it does, for all of our tissues that need all four, are i) the collection of O2 from the lungs and its delivery to all cells, ii) the collection of waste CO2 from all cells and the delivery of same to the lungs for dispersion, iii) the transport of nutrients from the intestine to the blood plasma, and iv) the collection of waste metabolites for direction to the excretia systems.

Plus, it buffers - that is, it smooths out unwanted 'concentration spikes', say of salt or sugar.

It is also a highway for chemical messages of all sorts. BOOM , loud noise, heart is beating more: Adrenalin (epinephrine) is exuded near the kidneys. In four seconds this signal gets from the adrenal gland to the heart - how --- via the Blood.

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15y ago

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