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

Clinical manifestations of bronchial asthma, Clinical Manifestations C...

Clinical Manifestations Can be chronic to acute, mild to severe. Acute attack often occur at night. During an acute attack, audible inspiratory and expiratory wheezing. Patie

What is the connection between tissue fluid and plasma, What is the connect...

What is the connection between tissue fluid, plasma and lymph? Tissue fluid is plasma (minus its proteins) which has leaked out of the capillaries. Lymph is tissue fluid which

Define food effect in the survival & growth of microorganism, Define Food E...

Define Food Effects in the Survival & Growth of Microorganism? Nature of the food also affects the microbial survival and growth. Each food has its own characteristics which de

Explain the most probable number (mpn), Explain the Most Probable Number (M...

Explain the Most Probable Number (MPN)? MPN is a statistical estimating technique which is based on the fact that more the number of bacteria in a sample, more is the dilution

What are the main constituents of the earth atmosphere, What are the main c...

What are the main constituents of the earth's atmosphere in our time? The present atmosphere of the earth is constituted mostly of molecular nitrogen (N2) and molecular oxygen

Indications for gingival curettage - endodontic surgery, Indications for Gi...

Indications for Gingival Curettage - Endodontic Surgery a) Persistent periradicular pathosis following endodontic treatment, b) Periradicular lesion that enlarges after endo

Respiratory protection - azotobacter, Respiratory Protection - Azotobacter ...

Respiratory Protection - Azotobacter In respiratory protection N 2 -fixing cells adjust the rate of .aerobic respiration according to prevailing oxygen tension i.e. rising and

Agro industrial-cobalt, Cobalt Cobalt functions as a component of vitamin ...

Cobalt Cobalt functions as a component of vitamin B12  (cobalamin). Ruminants are not dependent on a dietary source of vitamin B12  because ruminal microorganisms can synthesize B

Explain vasopressindrug term, Explain Vasopressindrug term? As a single...

Explain Vasopressindrug term? As a single bolus of 40 U, vasopressin has been recommended as an alternative to epinephrine in VF/pulseless VT refractory to defibrillation. Furt

Why does not gene therapy cure cystic fibrosis, Why doesn't gene therapy cu...

Why doesn't gene therapy cure cystic fibrosis? Although a normal gene is introduced into a patient's surface cells in the lung, these cells are not the ones that require produc

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