Explain the following phases in the menstrual cycle of a human female cbse Biology class 12

The Eduladder is a community of students, teachers, and programmers just interested to make you pass any exams. So we solve previous year question papers for you.
See Our team
Wondering how we keep quality?
Got unsolved questions?

Ask Questions

cbse-Biology-class-12-->View question

Explain the following phases in the menstrual cycle of a human female: cbse-Biology-class-12

i. Menstrual phase
ii. Follicular phase
iii. Luteal phase


Asked by:tarun101

Taged users:


Likes:
Be first to like this question

Dislikes:
Be first to dislike this question
Talk about this  Delete  Like  Dislike

Answers
i. Menstrual phase Menses takes place on the 3rd –5th day of the menstrual cycle of 28 days. Producing LH is considerably reduced. This  causes  degeneration  of  the  corpus  luteum  and  reduction  in  the production of progesterone and oestrogen. The uterine endometrium breaks down and menstruation starts. Endometrium cells, secretions, blood and the unfertilised ovum constitute menstrual flow.

ii. Follicular phase
The follicular phase  begins on the 6th day and lasts up to the 13th or 14th day in a 28-day menstrual cycle.

FSH stimulates the ovarian follicle to secrete oestrogen.

Oestrogen stimulates the proliferation of cells of the uterine endometrium.

The endometrium becomes thicker because of rapid cell multiplication. This is accompanied by the growth of the uterine glands and blood vessels.

iii. Luteal phase

The luteal phase  begins on the 15th day and lasts up to the 28th day in a 28-day menstrual cycle.

LH  causes  ovulation.  The  remaining  cells  of  the  ovarian  follicles  are stimulated by LH to develop the corpus luteum.

The  corpus  luteum  secretes  a  large  amount  of  progesterone  which stimulates  the  uterine  glands  to  produce  an  increased  amount  of  watery mucus.

Secretions  of  watery  mucus  by  the  vaginal  glands  and  the  glands  of  the fallopian tubes also increase.

Progesterone  also  maintains  the  endothelium  which  is  necessary  for  the implantation of the fertilised ovum and other events of pregnancy.

In  the  absence  of  fertilisation,  the  corpus  luteum  degenerates  which causes disintegration of the endothelium, leading to menstruation and the start of a new cycle.

Answerd By:Fututron

Likes:
Be first to like this answer

Dislikes:
Be first to dislike this answer
Talk about this  Delete  Like  Dislike

Can you help us to add better answer here? Please see this



You may also like our videos

Below are some of the videos from our collection. We saw that students not only needed content but also videos. So, we decided to build a video platform for you also an algorithm which shows best videos suites to you related to the content you are browsing check out some videos which suit best for you.

Lets together make the web is a better place

We made eduladder by keeping the ideology of building a supermarket of all the educational material available under one roof. We are doing it with the help of individual contributors like you, interns and employees. So the resources you are looking for can be easily available and accessible also with the freedom of remix reuse and reshare our content under the terms of creative commons license with attribution required close.

You can also contribute to our vision of "Helping student to pass any exams" with these.
Answer a question: You can answer the questions not yet answered in eduladder.How to answer a question
Career: Work or do your internship with us.Work with us
Create a video: You can teach anything and everything each video should be less than five minutes should cover the idea less than five min.How to upload a video on eduladder
Donate: Ad revenue alone is not able to take care of our server cost consider donating at least a dollar Click here to donate.


Not the answer you're looking for? Browse other questions from this Question paper or ask your own question.

Ask your question?