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The fertile human

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The fertile human Humans and other primates, such as apes and monkeys, are unusual in that they are able to mate at any time.This is not the case with most other animals. Some have a very brief breeding season, usually at a time of year that ensures there will be plenty of food for their young.This is not necessary for us because we are no longer dependent on the seasons. We can give birth and care for babies at any time of the year.

What is a human egg cell?

The ovaries of a newborn baby girl contain about 250,000 egg cells. By the time she reaches maturity, there will be about 10,000 remaining. However, only a few of these eggs will be used - one each month throughout the years when she can have a baby. Every 28 days, a swelling appears on an ovary. This releases the egg cell in a process cal led ovulation. The egg cell then enters the fallopian tube. The swelling it emerged from produces hormones to prepare the womb to receive the egg.

What is a period?

Each month, an egg cell is released from a female's ovaries. When this happens, the lining of the womb changes so that it is ready to receive the egg if it is fertilized. If the egg is not fertilized, the womb lining breaks down, and blood and tissue pass out through the vagina. This process is called a period, and it happens about every 28 days.The time from one period to the next is known as the menstrual cycle. Hormones from the pituitary gland and the ovaries control the menstrual cycle, which may be irregular. However, it usually settles into a regular cycle.

How does fertilization take place?

It takes two days for an egg cell to travel along the Fallopian tube. During this time it may be fertilized.The male's penis places sperm in the vagina, and about 300 million sperm are released. Some sperm pass through the neck of the womb and swim up into the uterus.They enter the Fallopian tube where some will meet the egg.Only one sperm may wriggle inside and fuse its own nucleus with the nucleus of the egg.

What is contraception?

Contraception prevents fertilization from taking place.There are several different contraceptive methods. One method involves a contraceptive device called a condom. It is a rubber covering, or sheal h that is worn over the penis to stop the escape of sperm. The contraceptive pill is a drug taken regularly by a female. It prevents the ovaries from producing ripe eggs, or stops the eggs from developing.

What happens after fertilization?

The fertilized egg begins to divide as it travels down the fallopian tube towards the womb. By the time it enters the womb it has divided into a ball of about 100 cells. It settles on the wall of the womb and sinks into the surface, becoming firmly fixed. At this point, the female is pregnant.


Tags: women, men



Category: Education  - ( Education Archive)

Date Added: 23 December '11


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