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 Genetic equilibrium for genes with two alleles, What is the mathema...

What is the mathematical expression of the genetic equilibrium for genes with two alleles? Is this statistical distribution the same as the statistical distribution of the respecti

Proteases of animals, Proteases of animals From the table you can see ...

Proteases of animals From the table you can see that these exopeptidases and endopeptidases attack specific peptide bonds depending on the chemical group near them. The inacti

Explain deep fat frying method, Deep fat frying Deep fat frying, as you...

Deep fat frying Deep fat frying, as you may already know, is the method which involves cooking food in hot fat/oil. The fat immediately surrounds the food and cooks it from all

Rabbit femur, describe the features of the rabbit femur bone

describe the features of the rabbit femur bone

How much time is required for a single cell, How much time is required for ...

How much time is required for a single cell of Detoxivicatium completeium to grown into a population large enough to fill the volume of the earth?

How lysosomal enzymes involved in the scavenging of aged, How Lysosomal enz...

How Lysosomal enzymes involved in the scavenging of aged Lysosomal enzymes are also involved in the scavenging of aged and damaged cells. In several diseased states and also by

Give source organism of the dna polymerase used in pcr, a) Mention the numb...

a) Mention the number of primers needed in each cycle of polymerase chain Reaction (PCR) . Write the role of primers and DNA polymerase in PCR. b) Give the characteristic fea

Explain kingdom protista, Kingdom Protista The protistans are a complex a...

Kingdom Protista The protistans are a complex and diverse group of organisms that are placed together simply because they are all single celled eukaryotes but some form rather sp

Describe how to prepare 200 ml of naoh, Describe how you would prepare 200 ...

Describe how you would prepare 200 ML of a 0.25 Msoluation of NaOH from a 3 M stock solution?

Explain what dietary factors, Michael eats steak & cheese sub sandwiches ev...

Michael eats steak & cheese sub sandwiches every day of the week. Explain the types of fats that are found in steak & cheese subs and the properties of each type. Jillian eats

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