How much blood is contained in the body of a person of average size, and what pro­portion of the blood goes to different organs?

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The Blood Supply

Q. How much blood is contained in the body of a person of average size, and what pro­portion of the blood goes to different organs?

A. Each organ requires a certain blood sup­ply according to its size and its functional ac­tivity. Wiggers has determined the amount of blood required by various parts of the body per minute. The figures given show the volume of blood in proportion to the organ supplied.

Leg………………………………………….5 per cent
Muscles……………………………………12 per cent
Heart………………………………………16 per cent
Stomach………………………………….. 21 per cent
Pancreas…………………………………..80 per cent
Liver………………………………………84 per cent
Brain…………………………………….136 per cent
Kidney…………………………………..150 per cent
Thyroid gland……………………………560 per cent

The activity of an organ and its importance to the body may be judged somewhat by the amount of blood which it requires. The amount of blood supplied the muscles may be increased during work to twenty times the volume received when at rest.


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