Integumentary system - glands, Biology

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Glands -

1. SEBACEOUS GLAND -

Absent in palm and sole. Holocrine in nature.
Branched, alveoli are present, sac like in appearance.
Generally attached to follicle but in free form on lips, prepuce labia majoris and labia minoris.
It's secretion is sebum, makes hair shinny & water proof.
In sebum 7-Dehydroxy cholesterol present that react with sun rays to form Vit. D (calciferol).

2. SWEAT GLAND OR SUDDORFFIC GLAND OR SERUS GLAND -

It is long tube like, coiled, embeded in dermis, opens out side by pore.
Each gland consists of secretory part & a duct.
Secretory part is greatly coiled & surrounded by myoepithelial cells assists in expelling the sweat.
It's secretion is sweat, it consists of 95% H O, 2% minerals & CO, 3% urea.
Sweat is meant for temperature regulation or thermoregulation or homeostatis, under control of thyroxine & sympathetic nervous system.
Nature is apocrine i.e. with secretion some cytoplasm come out.
In sweat, saliva, tear, lysozyme present to kill bacteria.
When body temperature rises the sweat glands release bradykinin which dilates b.v. to loss heat quickly.

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