The human body. A beginner's text-book of anatomy, physiology and hygiene (1884) (14596620267)

Identifier: humanbodybeginne00mart (find matches)

Title: The human body. A beginner's text-book of anatomy, physiology and hygiene ..

Year: 1884 (1880s)

Authors: Martin, H. Newell (Henry Newell), 1848-1896 Martin, Hetty Cary, (from old catalog) joint author

Subjects: Physiology

Publisher: New York, H. Holt and company

Contributing Library: The Library of Congress

Digitizing Sponsor: The Library of Congress

Text Appearing Before Image:

n; andthe tube through which the secretion is poured is nameda duct. Two kinds of glands empty theirsecretion on the skin. They are thesweaty or sudoriparous^ glands^ and the oil^or sebaceous, glands. 13. The Sweat-Glands (Fig. 23) makethe perspiration. They are very slendertubes which reach from the surface,through epidermis and dermis, to thefatty tissue beneath the skin. There thetube coils up into a knot. These glandsare found all over the skin, but notequally distributed. In the palm of thehand there are nearly three thousand toeach square inch: on the middle of theback, where they are fewest, about fourhundred in the same space. There arein all about two and a half milliotis ofsweat-glands, 14. The Pergpiration or Sweat is atransparent colorless liquid, consisting mainly of water. Anything tending to heat the bodycauses perspiration to flow more freely, so its amountis very variable. On an average, it is at least two poundsdaily. The sweat may dry up, or evaporate, as fast as it

Text Appearing After Image:

Fig. 23 —A sweat-gland, rt, horny lay-er of the cuticle; c,deeper layer of thecuticle; b, the der-mis. The duct of thegland is seen to runthrough the epider-mis and dermis andend in a coiled tnasspriaced in the fattytissue beneath theskin. 13. Describe a sweat-gland. What is the number of these glandsin a square inch of the palm ? Of the skin of the back? How many-are there altogether in the skin ? 14. Describe the sweat. Why is it variable in amount ? What isits average quantity ? What is insensible perspiration ? Sensible ? OIL-GLANDS, 6y is poured out: then it is named insensible perspiration.When it is poured out faster than it evaporates, sweatcollects in drops on the skin, and especially in regions, asthe forehead, where the glands are very abundant. It isthen named sensible perspiration. 15. The Chief Use of the Sweat-Glands is to cool thebody when there is danger of its becoming too hot.Whenever a liquid dries up or evaporates, it draws heatfrom whatever it lies on. Your sal

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1884

Library of Congress

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