The laws of health / [David Nunes Nabarro].

  • Nabarro, David Nunes, 1874-
Date:
[1905?]
Catalogue details

Licence: In copyright

Credit: The laws of health / [David Nunes Nabarro]. Source: Wellcome Collection.

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    THE HEART AND BLOOD-VESSELS 63. Whenever we cut or prick ourselves, no matter in what part of the body it may be, one or more drops of a bright red liquid will escape from the injured part. That bright red liquid is the blood which, during life, is found in every part of the body. Every organ and every tissue of the body has blood supplied to it, just as every house in a street has its supply of fresh water. The blood carries to the tissues and organs all the food and other nourishments they require to do their work properly. It also brings away from the tissues the waste substances they want to get rid of. The blood also distributes evenly over the body the heat produced by the muscles and liver. The organs do not contain blood as a sponge holds water, but the blood runs all over the body in a system of pipes called blood-vessels, just like the water or gas pipes in a house. 64. Blood as it escapes from a cut or wound is usually bright red in colour and opaque—that is to say, it is impossible to see through it. Blood is opaque because it has in it a very large number of exceedingly small bodies called blood cells or corpuscles. These corpuscles are so small that over three thousand of them placed side by side would measure only 1 inch. Being
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