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Updated: July 25, 2025
The blood meanders through these minute capillaries, depositing the oxygen taken from the lungs and the food of the stomach, and receiving in return the decayed matter, which is chiefly carbonic acid. This carbonic acid is formed by the union of oxygen with carbon or charcoal, which forms a large portion of the body.
Here it remains if it is impregnated or fertilized, and develops into the babe. If not impregnated, it passes off with the menstrual flow. Every twenty-eight days large quantities of blood are sent to the womb, producing a natural congestion. The pressure of this extra blood in the tiny capillaries of the womb stretches and weakens their walls.
As the blood rushes back to the surface it suffuses the skin, opens and relaxes the pores and the minute blood vessels or capillaries and thus unloads its impurities through the skin. Why We Favor Cold Water
But though the membranes, that compose the sides of the most minute vessels, are in truth unorganized materials, yet the larger membranes, which are perceptible to the eye, seem to be composed of an intertexture of the mouths of the absorbent system, and of the excretory ducts of the capillaries, with their concomitant arteries, veins, and nerves: and from this construction it is evident, that these membranes must possess great irritability to peculiar stimuli, though they are incapable of any motions, that are visible to the naked eye: and daily experience shews us, that in their inflamed state they have the greatest sensibility to pain, as in the pleurisy and paronychia.
Just as the extraordinary activity of life in birds is explained by that double oxygenization of blood, of which part takes place in the lungs and part in the reservoirs of air placed everywhere in the way of the capillaries, so this sudden increase of energy in the crocodile the moment it plunges into water may be explained by a second respiration suddenly established in the vast cavity of the abdomen, by the contact of the capillaries with the water which penetrates there.
There is nothing that so soon hastens decay and lends acerbity to age as giving up all business and responsibility, and every mode possible should be devised to prevent this result. As age advances, all the bodily functions move more slowly, and consequently the generation of animal heat, by the union of oxygen and carbon in the capillaries, is in smaller proportion than in the midday of life.
These convey to the lungs blood that has already been supplied with oxygen, passing it into the capillaries in the walls of the bronchi, bronchial tubes, and large blood vessels, as well as the connective tissue between the lobes of the lungs. This blood leaves the lungs partly by the bronchial veins and partly by the pulmonary veins.
#Cavernous Angioma.# This form of angioma consists of a series of large blood spaces which are usually derived from the dilatation of the capillaries of a subcutaneous nævus. The spaces come to communicate freely with one another by the disappearance of adjacent capillary walls.
Their exchanges must in all cases take place through the capillary walls and the layer of cells lining the alveoli. The small pits are alveoli, and the vessels in their walls are chiefly capillaries. The air enters and leaves the lungs by the same system of tubes.
The branches of the pulmonary artery lie alongside of, and divide similarly to, the bronchial tubes. From these capillaries the blood is conveyed by the pulmonary veins to the left auricle.
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