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

Define pseudo-yeasts, Q. What are the Pseudo-yeasts? These are like tru...

Q. What are the Pseudo-yeasts? These are like true yeasts but do not form spores. All the members of this group are particularly unsuitable for fermentation purposes as they p

Explain nutrition or diet counseling, Explain Nutrition or diet counseling ...

Explain Nutrition or diet counseling Nutrition or diet counseling  is a  primary educational activity  of  the dietitian.  It incorporates the idea of working with a patient, e

Light scattering, how does measurement of light scattering allows the growt...

how does measurement of light scattering allows the growth of cells to be monitored.

What is the function of the plant cell wall, Q. What is the function of the...

Q. What is the function of the plant cell wall? The plant cell wall has protective and structural functions. It plays an significant role in the constraint of the cell size, pr

Define estimation of blood thiamin levels - thiamin status, Define Estimati...

Define Estimation of Blood Thiamin Levels - Thiamin Status? The levels of free thiamin and its phosphoesters in whole blood and erythrocytes are measured using high- performanc

Some common air pollutants: oxides of sulphur, Oxides of sulphur:     ...

Oxides of sulphur:          It includes SO 2 , SO 3 . It is a colorless gas having sharp, pungent and suffocating odour. It is soluble in water and forms H 2 SO 4 . Sourc

Explain dietary diversification - iron deficiency anaemia, Explain the Diet...

Explain the Dietary diversification - Iron Deficiency Anaemia? It aims to ensure that deficient populations have access to foods rich in iron and also foods rich in vitamin C (

Explain structural and functional relationship, Describe the location and s...

Describe the location and structure of the pituitary gland and explain its structural and functional relationships with the hypothalamus.

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