Study of Glands

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What Are Apocrine Glands?
Apocrine glands are located in the skin, breasts, eyelids, and ears. They are a type of exocrine gland, which are glands that secrete hormones into a duct. Counterparts of exocrine glands are endocrine glands that secrete their hormones directly into the bloodstream. Certain endocrine glands also release hormones called pancrines that affect only specifically targeted cells very close to where they are released. Examples of endocrine glands are the pituitary gland, pancreas, adrenal gland, ovaries, and testes.
The modified apocrine glands located in the female breast are the milk-producing mammary glands. Additional, specialized apocrine glands located in the areola of the breast are responsible for secreting fat droplets into breast milk. Modified apocrine glands are located in the ears and aid in the formation of cerumen, more commonly known as earwax. In the skin and eyelids, the apocrine glands are sweat glands. The highest concentrations of apocrine sweat glands are located in the armpits and groin, and in the areola -- the darker skin surrounding the nipples of the breast -- of both human males and females.
While the bulk of actual sweat is produced by simple sweat glands called eccrine glands, apocrine glands in the skin act primarily as scent glands. Apocrine glands are considerably larger, are more deeply embedded in the skin, and produce a much thicker secretion than eccrine glands. Rather than cooling the body, the primary function of apocrine sweat glands is to produce a sexual scent that is as individual as a fingerprint. These glands become active once puberty sets in and play a vital part in sexual attraction.
The sex hormone scent, called a pheromone, enables communication with other members of the species by way of the olfactory sense, or sense of smell. One of the results of this silent, scent-based communication is sexual arousal. Even if humans aren't aware of it happening, it's been scientifically proven again

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