Menstrual cycle in human beings, Biology

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

Posted Date: 9/3/2012 3:51:28 AM | Location : United States







Related Discussions:- Menstrual cycle in human beings, Assignment Help, Ask Question on Menstrual cycle in human beings, Get Answer, Expert's Help, Menstrual cycle in human beings Discussions

Write discussion on Menstrual cycle in human beings
Your posts are moderated
Related Questions
Define precaution for estimation of vitamin c in lemon juice? 1. Rinse all glassware with 3% metaphosphoric acid before you begin your practical and subsequently each time you

What do the major organs of the digestive system do? They are salivary glands, teeth, tongue, gums, esophagus, stomach, small intestine, large intestine, pancreas, liver, and g

Historically how has the origin of life on earth been explained? The mainly recurrent explanation for the phenomenon of life on earth is the mythological. The People from vario

What are three main problems with having only two kingdoms There are three main problems with having only two kingdoms. The first problem concerns the unicellular flagellates

Explain Adverse effects of Atazanavir  Atazanavir causes indirect hyperbilirubinemia. It has had no adverse effects on lipid profiles, but the drug's long-term effects are unkn

Define Plan showing various steps of non-enzymatic browning? The plan showing the various steps of non-enzymatic browning is presented in figure Figure:

Phosphorus Phosphorus has been known as “master mineral” because it is involved in most metabolic processes. Phosphorus, which is stored in bones and teeth, is often discussed

Benefits of diet modification are: 1) Control of sugar. 2) Control of weight. 3) Control of blood pressure. 4) Control of lipid profile. 5) Good health and well bei

Define Dietary Management during Surgery? Surgery increases the nutritional demands of the body and can lead to the elicitation of several nutritional deficiencies/imbalance. M

Q. What is tubular secretion? What are some examples of substances secreted through the renal tubules? Uric acid, Ammonia, potassium bicarbonate and hydrogen ions, bases and me