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

Asymmetrical and spherical - metazoa, Asymmetrical and Spherical - Metazoa ...

Asymmetrical and Spherical - Metazoa Some creatures are asymmetrical: no matter which way we try to divide them through the middle, no two halves would appear alike. In simple

Define dietary habits factor for obesity, Define Dietary habits factor for ...

Define Dietary habits factor for obesity? You are aware that a positive energy balance is one of the major contributory factors for obesity. Some people are in the habit of eat

Mollusca, commercially important bivalve species

commercially important bivalve species

Digestive system, describe the effects of the failure of the pancreas to pr...

describe the effects of the failure of the pancreas to produce sufficient insulin

What is simple transposition in neonates, What is Simple Transposition in N...

What is Simple Transposition in Neonates ? A baby with this malformation needs to be operated without delay. A very cyanosed infant will require palliation by balloon arteries

Why are glucorticoids used in transplant patients, Why are glucorticoids us...

Why are glucorticoids used in transplant patients? Patients with transplanted organs are prone to host versus graft rejection as their own immune system tends to attack the gr

Woodland stage - hydrarch, Woodland Stage - Hydrarch When the lowland ...

Woodland Stage - Hydrarch When the lowland has been built up to an extent where the soil is saturated perhaps only in spring and early summer, certain species of shrubs and tr

Codeine, CODEIN E - It is methylmorphine, obtained from opium. I...

CODEIN E - It is methylmorphine, obtained from opium. It is used in cough syrups. A notable side effect of codeine is constipation.

Optical defects of eye, Give an introduction for optical defects, of eye fo...

Give an introduction for optical defects, of eye for an assignment?

Bones, which bone forms the non-moving muscle attachment in the hip joint

which bone forms the non-moving muscle attachment in the hip joint

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