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

Evaluating the degree of urinary obstruction, Evaluating the degree of urin...

Evaluating the degree of urinary obstruction: D.P. is a 63-year-old man who has been experiencing progressive difficulty with initiating the urinary stream and frequently needs to

What do digestive enzymes do to food, What do digestive enzymes do to food?...

What do digestive enzymes do to food? Digestive enzymes suspend food; make food soluble, break large insoluble food molecules into smaller, soluble molecules

Mollusca, family ,genus, class order , species of mollusca

family ,genus, class order , species of mollusca

Discuss about xeno-transplanation, Discuss about xeno-transplanation Mo...

Discuss about xeno-transplanation Most defects / diseases treated by xeno-transplanation are not genetic in origin so the therapy will have no impact on gene pool in terms of c

What are the three parts of a dna nucleotide, What are the three parts of a...

What are the three parts of a DNA nucleotide, and how are they connected to each other? The three types are a deoxyribose sugar, a phosphate group, and a nitrogenous base. The

Explain the secretary phase - menstrual cycle, Explain the Secretary Phase ...

Explain the Secretary Phase - Menstrual Cycle After ovulation, the lining of ovarian follicle is stimulated by LH to develop corpus luteum which produces progesterone. The endo

Plant reproduction, How does being able to reproduce asexually benefit the ...

How does being able to reproduce asexually benefit the plant?

Define the nutritional and functional role of nickel, Minerals :-Nickel  ...

Minerals :-Nickel  Food Source      Plant foods  Nutritional Functional role Essential nutrient: Deficiency in humans unknown. Catalyst: hydrogenation in

Do all molecules of dna have the same amounts, Q. Do all molecules of DNA h...

Q. Do all molecules of DNA have the same amounts of nitrogenous bases? Number and sequence of nitrogenous bases in DNA molecule are key elements in variations which are found i

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