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GnRH
Structure from which it originates: Hypothalamus
The structure on which it acts: Anterior pituitary
The hormones function: It is classified as a releasing hormone responsible for the
release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the
anterior pituitary gland (Ehlers and Halvorson, 2013).
The effect it has on other hormones: It stimulates the secretion of FSH and LH by the
anterior pituitary gland.
Male hormones
Testosterone
Structure from which it originates: Testicles
The structure on which it acts: Male reproductive organs, testes, prostate, penis etc.
The hormones function: testosterone plays a principal role in the development of male
reproductive tissues such as the testis and prostate, as well as promoting the
development of secondary sexual characteristics e.g. greater muscle and bone mass,
and the growth of body hair. Additionally, testosterone is responsible for general
health and well-being, and the avoidance of osteoporosis.
The effect it has on other hormones: Not much.
Follicle Stimulating hormone
Structure from which it originates: Anterior pituitary gland
The structure on which it acts: Testes
The hormones function: FSH induces Sertoli cells (Bowen, 2004) to secrete
androgen-binding proteins (ABPs), regulated by inhibin's negative feedback
mechanism on the anterior pituitary. It results in spermatogenesis.
The effect it has on other hormones: It stimulates Inhibin secretion.
Luteinizing Hormone (LH)
Structure from which it originates: Anterior Pituitary gland
The structure on which it acts: Testes
The hormones function: LH acts on the Leydig cells ((Bowen, 2004) of testis and its
regulation is done by gonadotropin-releasing hormone (GnRH). The Leydig cells
secrete testosterone under the influence of LH.
The effect it has on other hormones: Pituitary gland secretes LH and this secretion is
controlled by gonadotropin-releasing hormone. Low testosterone levels stimulate
GnRH secretion by hypothalamus, resulting in LH secretion by the pituitary gland.
Raised testosterone levels act on the hypothalamus and pituitary via negative
feedback mechanisms and inhibit the secretion of GnRH and LH

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.
GnRH
Structure from which it originates: Hypothalamus
The structure on which it acts: Anterior pituitary
The hormones function: GnRH is a releasing hormone involved in the release of
follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior
pituitary
The effect it has on other hormones: It stimulates the secretion of FSH and LH from
the anterior pituitary gland (Ehlers and Halvorson, 2013).
Inhibin
Structure from which it originates: It is secreted from the Sertoli cells, located in the
seminiferous tubules inside the testes.
The structure on which it acts: Anterior pituitary gland.
The hormones function: inhibin down regulates FSH synthesis and inhibits FSH
secretion.
The effect it has on other hormones: inhibin inhibits FSH secretion. Androgens
stimulate the production of inhibin.
Task 2b
Structure & function
Female organs
Ovaries
Ovaries are oval shaped female reproductive organs lying in the pelvis and are
responsible for production of ova i.e. the female gametes.
Fallopian tubes
Fallopian tubes are two fimbriated tubes which are connected to uterus on one end to
the uterus and open up in front of ovaries on their respective sides. They carry ova
from ovaries to the uterus.
Uterus
Uterus lies in the pelvis immediately. Structurally, it is a pear shaped organ.
Anatomically it has four regions:
The fundus,

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GnRH Structure from which it originates: Hypothalamus The structure on which it acts: Anterior pituitary The hormones function: It is classified as a releasing hormone responsible for the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior pituitary gland (Ehlers and Halvorson, 2013). The effect it has on other hormones: It stimulates the secretion of FSH and LH by the anterior pituitary gland. Male hormones Testosterone Structure from which it originates: Testicles The structure on which it acts: Male reproductive organs, testes, prostate, penis etc. The hormones function: testosterone plays a principal role in the development of male reproductive tissues such as the testis and prostate, as well as promoting the development of secondary sexual characteristics e.g. greater muscle and bone mass, and the growth of body hair. Additionally, testosterone is responsible for general health and well-being, and the avoidance of osteoporosis. The effect it has on other hormones: Not much. Follicle Stimulating hormone Structure from which it originates: Anterior pituitary gland The structure on which it acts: Testes The hormones function: FSH induces Sertoli cells (Bowen, 2004) to secrete androgen-binding proteins (ABPs), regulated by inhibin's negative feedback mechanism on the anterior pituitary. It results in spermatogenesis. The effect it has on other hormones: It stimulates Inhibin secretion. Luteinizing Hormone (LH) Structure from which it ...
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Very useful material for studying!

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