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What are the only tastes perceived in the mouth? 12. What does a coated tongue mean? 13. Is the sense of taste a safe guide in choosing foods? Why? 14. What are adenoids? What trouble do they cause? How can they be cured? 15. How does the eye help to choose food? 16. Name and describe the parts of the face around the eye. 17. Of what use is each? 18. How does the tear gland act? 19.
The liver, phylogenetically older than the stomach, is a large gland, rich in blood, in the adult man, immediately under the diaphragm on the left side, and separated by it from the lungs. The pancreas lies a little further back and more to the left.
This is a purely sexual gland, which in animals only becomes large and active during the breeding season, and may even be hardly distinguishable at other times; moreover, if the testes are removed in infancy, the prostate remains rudimentary, so that during recent years removal of the testes has been widely advocated and practiced for that hypertrophy of the prostate which is sometimes a distressing ailment of old age.
Sweat gland and duct. i, k. Hair and follicle. l. Oil gland. On the outer surface of the dermis are numerous elevations, called papillæ. These average about one one-hundredth of an inch in height, and one two hundred and fiftieth of an inch in diameter. They are most numerous on the palms of the hands, the soles of the feet, and the under surfaces of the fingers and toes.
Its importance and function as a gland of internal secretion has become known only recently. Many still doubt and question the accordance of that rank to it. But feeding experiments with it, in various endocrine disturbances in human beings, have proved its right to the title.
As the extremities of the glands are of exquisite tenuity, as appears by their difficulty of injection, it was necessary for them to secrete their fluids in a very dilute state; and, probably for the purpose of stimulating them into action, a quantity of neutral salt is likewise secreted or formed by the gland.
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