The Organs of Secretion.
THE exhalants, the follicles, and the glands are the organs of
secretion. The Exhalants are the sweatglands. These have external
terminations upon the skin, thus communicating with the air, and
internal terminations upon the surfaces of organs not having an outward
exposure.
The Follicles are small sacs, located in the true skin and mucous
membranes. The pores of the skin are the mouths or outlets of these
little bags. Veins and organic nerves are sent to these vessels.
Glands are soft organs, having a variety of structure, and performing
many kinds of secretion. A gland is made up of several lobules,
united in one mass, and each of these lobules has a small duct,
communicating with a main duct which forms the outlet. Fig. 39 shows a
gland ; 2, the small ducts spread through its body, and running
together; 1, the large duct, through which the secreted substance is
carried away.
The mesenteric and lymphatic glands merely modify the fluids which pass
through them; others secrete from the blood either fluids to be used in
the body, or such as are to be cast away.
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