Science
Important Topics:-
☺Sexually transmitted diseases(STDs)
1. Bacterial infections: (a) GONORRHOEA
(b) SYPHILIS
2. Viral infections: (a) AIDS- Acquired Immuno Deficiency Syndrome
(b) GENITAL WARTS
☺Fertilisation and post fertilisation changes
The fusion of nucleus of the sperm and ovum is known as fertilisation. This process in human takes place in the following ways:
1. The male gamete enters into the female genital tract by the process of copulation or mating.
2. Fertilisation takes place in the oviduct or Fallopian tube.
3. Fertilisation only occurs, if egg is present in the oviduct.
4. When male and female gametes fuse to each other it will form Zygote.
5. The zygote undergoes various mitotic division to form an embryo.
6. The embryo sinks down and reaches into the soft and thick lining of the uterus.
7. The embedding of the embryo in the thick lining of the uterus in known as implantation.
8. After develops embryo will be known as Foetus.
Nutrition of Foetus(Baby):
During Pregnancy, a special disc like tissue called PLACENTA grows between the uterine wall the embryo.
Placenta forms finger-like projections called villi towards embryo.
This create large surface area for the exchange of glucose and oxygen between the mother and the embryo.
Birth Control:
A number of methods have been developed to prevent and control pregnancy. these methods are:
1. Barrier Method: Condom, Diaphragm, IUCD(Intera Uterine Contraceptive Device.
2. Hormonal Method: Oral pills
3. Chemical Method: Spermicide
4. Surgical Method: Vasectomy, Tubectomy
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