Menstrual cycle in human beings, Biology

Assignment Help:

Menstrual cycle in human beings:

1) The cycle of changes in the female reproductive system that leads to formation of Ovum is called 'menstrual cycle'. It occurs once in 28 to 30 days.

2) During this cycle only one ovum is released and it alternates between the two ovaries in successive months.

3) This cycle starts from the age of 13 to 14 years of age and continues upto 50 to 55 years. Then the production of ova usually stops.

4) The menstrual cycle has two phases. They are  1) Proliferative phase 2) Secretary phase.

Proliferative phase :

5. During the proliferative phase, cells present in the ovarian follicle, fallopian tubes, uterus and vagina increase in their number of mitotic divisions. The ovum is released.

6. The proliferative phase occurs during 12 to 14 days of the cycle and the ovum is released usually on the 14th day of the cycle.

Secretary phase :

7. The second half of the menstrual cycle is called secretary phase which occurs in the next 14 to 16 days. During this phase the ruptured follicle changed into corpus luteum and uterine walls are thickened. If implantation does not occur by 26th day the cells of corpus luteum and the walls of the uterus are detached and expelled out along with some amount of blood and the cycle continues.

8. The menstrual cycle is under the control of hormones secreted by the pituitary gland and ovaries.

500_menstrual cycle in human beings.png


Related Discussions:- Menstrual cycle in human beings

Explain fibre and cardiovascular disease (cvd), Explain Fibre and Cardiovas...

Explain Fibre and Cardiovascular Disease (CVD)? The role-of dietary fibre in modulation of blood lipids was demonstrated by Keys and his co-workers in a series of experiments c

Primary tubercle, Primary  Tubercle  (Ghon Tubercle): When  an  indiv...

Primary  Tubercle  (Ghon Tubercle): When  an  individual with  no  previous exposure  to  tuberclosis inhale a sufficient number of  tubercle bacilli into the alveoli, tubercu

Explain saquinavir, Explain Saquinavir Saquinavir (SQV, Fortovase, Invi...

Explain Saquinavir Saquinavir (SQV, Fortovase, Invirase) - When administered as a single protease inhibitor, a soft-gel preparation (Fortovase) with improved bioavailability an

What is hyperhomocysteinaemia, What is Hyperhomocysteinaemia ? Homocyst...

What is Hyperhomocysteinaemia ? Homocysteine has been considered as a risk factor for Cardio-vascular diseases because of many epidemiological and observational studies showing

Lysosomes, Lysosomes Lysosomes are small vesicles which are bounded ...

Lysosomes Lysosomes are small vesicles which are bounded by a single membrane & contain hydrolytic enzymes in the form of minute crystalline or semi crystalline granules of

What concentration of sucrose solution should administered, The volume of M...

The volume of Mrs. X's plasma was 3 liters before Ed administered the IV. Assume that there was a complete mixing of the administered water with her plasma but no mixing with her i

How surgical technique affect osseointegration, How Surgical technique affe...

How Surgical technique affect Osseointegration The osteotomy preparation is critical both from biologic and biomechanical points of view. The bone drilling should be sequential

Marine biology, What are the four characteristics that all chordates have ...

What are the four characteristics that all chordates have at some stage of their lifecycle ?

Protozoans, Protozoans Prokaryotes represent only a few thousand of th...

Protozoans Prokaryotes represent only a few thousand of the estimated 2 million species of living beings known on the earth today. The rest are mostly eukaryotes that form the

Define excretion of toxin and act as precursor- carbohydrate, Define Excret...

Define Excretion of toxins and Act as precursors? Excretion of toxins: Glucuronic acid, a metabolite of glucose, combines with chemical and bacterial toxins and some normal met

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