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The Secretion and Perspiration Processes
How we process and secrete substances depends on the type of gland that is doing the work. There are numerous substances that we secrete (e.g. sweat, milk, saliva, insulin, tears, stomach acid, etc.) and they essentially undergo three different types of processes. These are called merocrine, apocrine and holocrine. Merocrine is the simplest process and includes the secretion of sweat. In this process, packets of substances ready for secretion are delivered to the cell's surface and are released.
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The aprocrine process (see below) is similar to the merocrine but differs in that the vesicle or packet that reached the cell's surface is actually pinched off. The materials that are secreted is this manner tend to be more complex in terms of their ingredients. Examples include mammary and apocrine sweat glands.
Finally, the holocrine process is almost identical to the apocrine process but actually releases the contents of the entire secretory cell. Not only are its contents released, but cell fragments are included within the secretions. This process involves the death of the secretory cell. Some sweat glands located in the axillae, the pubic areas and the areolae of the breasts release their products in this manner. Another example includes the acne related glands or the sebaceous glands.
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The Three Processes of Secretion/Perspiration
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