How does menstrual cycle begin, Biology

Assignment Help:

Does the hypophysis-ovaries endocrine axis work in the same way during pregnancy as in non-pregnant women? If pregnancy does not occur how does another menstrual cycle begin?

The functioning of the hypophysis is changed during pregnancy. As estrogen and progesterone levels remain elevated during the gestational period the production of GnRH (gonadotropin-releasing hormone) from the hypothalamus is inhibited. The lack of GnRH therefore inhibits the secretion of FSH and LH from the hypophysis and a new menstrual cycle does not start.

If pregnancy does not happen the lowering of estrogen and progesterone levels stimulates the production of GnRH by the hypothalamus. This hormone then hastens the adenohypophyseal secretion of FHS and LH that in their turn stimulate the maturation of follicles and the starting of a new menstrual cycle.

 


Related Discussions:- How does menstrual cycle begin

Explain the process of metastasis, Explain the process of metastasis. Defin...

Explain the process of metastasis. Define anti-angiogenic drugs and relate the role of medical imaging, if any, in anti-angiogenic drug therapy. State how you envision your particu

Limb regeneration in amphibians, Limb Regeneration in Amphibians In v...

Limb Regeneration in Amphibians In vertebrates, the amphibians particularly the urodeles comprise spectacular power of regeneration. This power of regeneration has made them

Issues impacting health and development - limited resources, Normal 0 ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Amnion adaptation to terrestrial life, Q. Why can the amnion also be consid...

Q. Why can the amnion also be considered an adaptation to terrestrial life? The amnion is as well an adaptation to dry land since one of its functions is to prevent desiccation

What is the antagonism of the sympathetic, What is the antagonism between t...

What is the antagonism between the sympathetic and the parasympathetic neural actions? In general the actions of the sympathetic and the parasympathetic are antagonistic, i.e.,

Signify platelets of blood, Which of the subsequent statements concerning p...

Which of the subsequent statements concerning platelets is INCORRECT. Platelets: a) Are between 1/2 and 1/3 the diameter of the red cell b) Are roughly disk-shaped c) Hav

Pets, Pets, Medical Research and Zoos - Wildlife Animals and plants ar...

Pets, Medical Research and Zoos - Wildlife Animals and plants are gathered throughout the world for zoos, private collectors, pet shops and researchers in biology and medicine

Push the food down through the esophagus, Q. Which is the kind of muscle ti...

Q. Which is the kind of muscle tissue that helps to push the food down through the esophagus? The esophageal wall in its superior portion is made of skeletal striated muscle th

Explain the peripheral nervous system in detail, Explain The Peripheral Ner...

Explain The Peripheral Nervous System in detail? The peripheral nervous system is divided into the somatic nervous system and the autonomic nervous system. The somatic nervous

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd