Explain the various events which occur during menstrual cycle.

Solution

Menstrual cycle is the cyclic changes of the endometrial wall of uterus.
The various events which occur during the mensrual cycle are-:

Menstruation Phase :
During this phase menstrual flow occurs. The breakdown of endometrium lining of uterus and its blood vessels leads to discharge in form of liquid through the vagina. It lasts for 3-5 days.

Follicular phase
During this phase the primary follicles grow to form mature Graafian follicles and the uterus wall regenrates simultaneously. The secretion of the lutenizing hormone(LH) and the follicular stimulating hormone (FSH) brings about the changes in the uterus. The LH and FSH homones leads to the secretion of estrogen and follicular development respectively. It lasts upto 14th day.

Ovulation phase (14th day)
During this phase the Graafian follicle rupture to and thereby release ovum.

Luteal phase
During this phase the corpus luteum is formed from the remaining part of the Graafian follicle . the corpus luteum secrets progesterone which helps maintain the endometrium needed for implantation. In the absence of fertilization the corpus luteum degenerate. It is from 15th to 28th day.

Some More Questions From Human Reproduction Chapter

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Human Reproduction

Explain the various events which occur during menstrual cycle.

Some More Questions From Human Reproduction Chapter

Polar bodies are produced during the process :

In 28 days woman's menstrual cycle, ovulation occurs on :

Scrotum communicates with abdominal cavity through :

How many spermatozoa or sperms are present in human ejaculate ?

Acrosome is a part of:

Humans are :

Menstrual cycle occurs in :

Spermatozoa are produced in the .................. tubules of testes while ova are formed in the .................. of ovaries.

Corpus luteum secretes..................while Leydig cells secrete..................

The secretory phase of the menstrual cycle is also called the.................. phase because it is controlled by the hormone...................

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