The Laws of health.

  • Nabarro, David, 1874-
Date:
1905
Catalogue details

Licence: In copyright

Credit: The Laws of health. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    blood (containing much oxygen and food nourishment) to the brain, muscles, stomach and every part of the body except tlie lungs. On its way through these tissues (brain, muscles, etc.) the blood gives up oxygen and nourishment to the tissues, and receives in exchange COo and other waste substances from the tissues. The blood as it passes through the walls of the stomach and intestines receives digested food which it carries to the heart to be distributed to all the organs of the body. 80. The blood from all parts of the body except the lungs is carried back to the heart by two large veins, called the superior vena cava and the inferior vena cava, which open into the right auricle. The blood in the right auricle is good blood because it contains much food nourishment, but it is also bad blood because it contains much GO.,, which it has collected from all the organs and tissues of the body. On account of the large amount of CO2 and the small amount of oxygen in it, the blood in the right auricle is dark purplish-red in colour. From the right auricle this dark blood flows into the right ven- tricle. The next time the heart beats, the blood, which cannot flow back into the auricle on account of the valve at the opening, leaves the ventricle by the pulmonary artery which goes to the lungs. In the lungs this artery divides into smaller and smaller branches, and finally into capillaries. Through the very thin walls of these capillaries the COo passes out of the blood which receives oxygen in exchange. In this way the dark impure blood, which was carried to the lungs from the right side of the heart, is changed to bright red pure blood. This pure blood is carried from the lungs by the pulmonary veins to the left auricle. From the left auricle