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

Bacterial cells, which intracellular organelles are present in bacteria?

which intracellular organelles are present in bacteria?

What is asymmetric carbon atom, Asymmetric carbon atom   : a carbon atom at...

Asymmetric carbon atom   : a carbon atom attached with four different groups or atoms.

Define about the probiotics, Define about the Probiotics? Dietary Sourc...

Define about the Probiotics? Dietary Sources and their Mode of Action/Effects We can have specific preparations designed for probiotic use, as well as, foods. Probiotic product

What does acute disease mean, What does acute disease mean? An sharp di...

What does acute disease mean? An sharp disease is which does not last for a longer duration n has no weakness in the body

What nerve is being compressed, what major nerve do you think is being comp...

what major nerve do you think is being compressed when a person often feel pain in the posterior surface of the thigh radiating to the area behind the knee and where is the likely

Symptoms of non-ketotic hyperosmolar diabetic coma, Q. Symptoms of Non-Keto...

Q. Symptoms of Non-Ketotic Hyperosmolar Diabetic Coma? Following are the signs and symptoms of NKHDC: 1) Polyuria 2) Polydipsia 3) Weight loss 4) Mental Confusion

Is rabies caused by virus or by bacteria?, Q. Is rabies caused by virus or ...

Q. Is rabies caused by virus or by bacteria? How is it transmitted? Which organs and tissues are affected by the disease? How is it prevented and treated? The Rabies, as well k

Genetics, What is pedigree analysis . How to solve the complicated question...

What is pedigree analysis . How to solve the complicated questions of pedigree . How to identify wheather it is dominant or reccessive its genotype

Respiratry system, prepare a power point presantation of respiratry system

prepare a power point presantation of respiratry system

How the arrangement of cells helps with tissue functioning, PROVIDE a speci...

PROVIDE a specific example for epithelial and connective tissues, how the arrangement of cells helps with tissue functioning?

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