. Adventures with animals and plants. Biology. 254 How a Complex Aniinal Uses Food unit iv. Fig. 244 T/.ie sex glavds of this silver-laced JVyandotte rooster (on the left) were removed. As a result he changed into the hen-feathered bird shown on the right. What is the difference in pliniiage? (u. s. bureau of animal industry) as acromegaly) is due to oversecretion by the gland later in life. It is sometimes treated by an operation on the gland. With an undersecretion of the hormone in a child, growth of the bones is stopped at an early age; the result is a midget. In cases of undersecretion M'
. Adventures with animals and plants. Biology. 254 How a Complex Aniinal Uses Food unit iv. Fig. 244 T/.ie sex glavds of this silver-laced JVyandotte rooster (on the left) were removed. As a result he changed into the hen-feathered bird shown on the right. What is the difference in pliniiage? (u. s. bureau of animal industry) as acromegaly) is due to oversecretion by the gland later in life. It is sometimes treated by an operation on the gland. With an undersecretion of the hormone in a child, growth of the bones is stopped at an early age; the result is a midget. In cases of undersecretion M'hich are not too severe, extracts of the pituitary gland have been injected but so far without much success. The pituitary — the "master ; The anterior portion of the pituitary fjland secretes other hormones besides the one which affects growth of the skeleton. These hormones affect the reproductive organs, the thyroid, the outer part of the adrenals, and other ductless glands. That is, the pituitary with its variety of hor- mones has many important direct and in- direct effects. Because of its influence on so many parts of the body it has received the name of the "master ; The posterior portion of the pituitary gland also produces several hormones. They affect the body in various \\avs, one of which is to stimulate the contrac- tion of smooth muscles. You will remem- ber that the walls of the digestive org^ans contain smooth or involuntary muscle cells. You have no direct control over such muscles. But they "obey" this pituitary hormone which comes to them through the blood. The tiny muscles in the walls of the arteries are also smooth muscles; they too are made to contract more violently by this hormone. Other ductless glands. It is not difficult to obtain specimens of ductless inlands from the butcher. Study them and an- swer the questions in Exercise 5. In close contact with the thyroid are the two much smaller parathyroids. The s
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Keywords: ., bookcentury1900, bookpublisherbostondcheath, booksubjectbiology
