Blog Assignment: Part Three

Long Distance Communication (Endocrine)

Endocrine signalling involves the transfer of information from one cell to another, where an endocrine hormone is transported from the signal-producing cell to the receiving cell through the circulatory system. This can be achieved via the blood plasma, lymph or cerebrospinal fluid since the signal producing cells and the signal receiving cells are distant to each other, therefore communication over long distance.

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This process occurs, for example, between the basophil cell of pituitary gland and the oocyte cell of the reproductive system. Generally, hormones are chemicals that are released into the blood stream to perform a specific function with respect to its target cell. Basically, they function in facilitating the regulation of body functions by either stimulating or inhibiting other cells. The ovaries are just one of the many organs in the body regulated by hormones. Initially, a follicle grows within one of the ovaries; a follicle consists of the developing egg cell and the support cells that surround, providing the required nourishments. As this occurs, a small structure in the brain, the pituitary gland (specifically the basophil cell) releases hormones, mostly FSH which induces the follicles to begin growth.

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The dominant follicle releases a hormone, estrogen which prepares the lining of the uterus for the egg. As this occurs, the estrogen in the blood stream enables the brain to release a surge of LH which results in the rapid enlargement of the follicle. Approximately 24 to 36 hours after the LH exposure, the follicle disintegrates and thus releases the egg cell (ovulation).

 

 Reference: 

http://www.pennmedicine.org/encyclopedia/em_DisplayAnimation.aspx?gcid=000045&ptid=17

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