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The Elder laughed without restraint, and his visitor began to show signs of uneasiness. "You'd best be careful with them delicate blood-vessels," mildly suggested the Captain. "True, Josiah. But that was a good joke, a very good joke. One can take it in two ways." "Not the way I mean it. There's enough gossip " "Yes, we are too selfish," broke in the Elder, "and it is too bad.
When all these organs are strong and healthy, they can bear this increased labor without injury. But if the lungs are weak, the blood sent from the skin by the chill engorges the weak blood-vessels, and produces an inflammation of the lungs. Or it increases the discharge of a slimy mucous substance, that exudes from the skin of the lungs.
This process of cutting off the circulation in the scalp is largely aided by the tight hats and caps worn by men, which compress the blood-vessels. It is quite noticeable that people with round heads have a greater tendency to become bald than those with more irregular heads. The reason is probably that the hats fit more snugly on the round-headed people. There are many exceptions.
The continuous line represents the basement membrane. The dotted line represents the position of the cells on one side of the basement membrane. The irregular lines show the position of the blood-vessels. The practical details of these and other tests which assume some knowledge of chemistry, should be learned from some manual on the subject. The Peritoneum.
Now every beat of the heart sends two ounces of blood into the minute, hair-like blood-vessels, called capillaries, that line these air-cells, where the air in the air-cells gives its oxygen to the blood, and in its place receives carbonic acid. This gas is then expired by the lungs into the surrounding atmosphere.
Around these cells are found the smallest of the blood-vessels, the capillaries, between which and the tissues a sort of physiological barter is continually going on, the capillaries handing over oxygen and food supplies from the blood, and receiving waste materials in return, as the blood creeps along at a very slow rate.
Thus, terror dilates the pupils, fear acts upon the nerves of the small blood-vessels of the face to produce pallor, and the sight of an accident, or even the emotions produced by hearing of one, may excite nausea and vomiting.
The distinction between lymph, chyle, and blood-vessels which is found in all the Craniotes may be regarded as an outcome of division of labour between various sections of our originally simple vascular system. In the Gnathostomes the spleen makes its first appearance, an organ rich in blood, the chief function of which is the extensive formation of new colourless and red cells.
When the woman was not pregnant they were still less voluminous and seemed to consist of an immense mass of wrinkled, flaccid skin, traversed by enormous dilated and varicose blood-vessels, the mammary glands themselves being almost entirely absent. Diffuse hypertrophy of the breast is occasionally seen in the male subject.
Certain points excite the sensation of warmth, others of cold, although the temperatures of the skin and of the instrument remain constant. Necessity for Personal Cleanliness. It is evident that the skin, with its myriads of blood-vessels, nerves, and sweat and oil glands, is an exceedingly complicated and important structure.
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