Lets learn about follicle stimulating hormone,
luteinizing hormone and prolactin. These hormones are secreted by the pituitary
gland which is located just under the brain in the sphenoid bone.
The anterior portion of the pituitary gland contains a vascular network called the hypophyseal
portal system. There is a 2 step process for releasing anterior
pituitary hormones. First, a releasing hormone is secreted by
the hypothalamus. The releasing hormone travels to the anterior
pituitary through the blood vessel system. Next, an anterior pituitary hormone is secreted
in response to the releasing hormone. Lets look at one releasing hormone known as
gonadotropin releasing hormone or GNRH. GNRH facilitates the release of 2 hormones..Follicle
stimulating hormone or FSH and luteinizing hormone or LH.
Lets look at FSH In females FSH helps the ovarian follicle
develop and promotes estrogen secretion. In Males, FSH promotes sperm development.
The other hormone that responds to GNRH is luteinizing hormone or LH.
In females: LH stimulates ovulation and promotes secretion of estrogen and progesterone by
the ovaries. In males, LH stimulates the production of
testosterone. Prolactin is another hormone released by the
anterior pituitary but is not affected by GNRH secretion.
Prolactin promotes milk production by the mammary glands.
Prolactin secretion is partially controlled by one hypothalamic releasing hormone called
prolactin inhibiting hormone or PIH. PIH works to inhibit the secretion of Prolactin
by the anterior pituitary. We hope you have learned something about FSH,
LH and prolactin and.see you next time.