reproduction in humans

are a pair of oval structures that are present one on either side. The ovaries produce eggs, one at a time, every alternate month. The eggs are produced by the germinal epithelial cells of the ovary. Human Female Reproductive Sys..

Human ovaries are a pair of almond shaped structures about 3cm long, 1.5cm wide lying one on either side of the vertebral column in the abdominal cavity. Each ovary is attached to the dorsal abdominal wall by a mesentery called mesovariu..

These are a pair of rounded structures present on ventral thoracic wall with a nipple in its middle. The breast has about 20 lobes of mammary glands which are modified sweat glands. These lobes secrete milk to nourish the new born baby. Each lobe is separated from the others by dense connective and..

All living organisms reproduce. Reproduction results in the formation of offspring of the same kind. A pea plant produces only pea plants each time it reproduces. A rat produces only rats. Humans produce only humans..

The ovum is the female haploid gamete which fuses with the sperm and develop into an organism after fertilisatio..

The process of spermatogenesis occurs in the seminiferous tubules of the testes. The whole developmental process of proliferation of spermatogonia or the sperm mother cells to mature spermatozoa or sperm is called as spermatogenesis. The functional spermatozoa or sperms have haploid number of chrom..

Fertilisation can be defined as the fusion of the sperm nucleus with the egg nucleus to form a diploid cell known as zygote. The fertilisation is internal in the human reproductive system. It is achieved by the insertion of the male organ, penis into the vagina of the female. T..

It is called tocopherol and is fat soluble. Its function in humans is unknown. However, in rats it affects muscles and the reproductive system and prevents breakdown of red blood cells. Deficiency can cause anaemia. The sources are cereal germ oils (wheat germ oil, corn germ oi..

Heredity and Variation - All living organisms reproduce. Reproduction results in the formation of offspring of the same kind. A pea plant produces only pea plants each time it reproduces. A rat produces only rats. Humans produce only humans. However, the resulting offs..

Polynuclear aromatic hydrocarbons enter the body quickly and go to the fat containing tissues. There is little data available for the toxic effects of naphthalene on humans. Short-term low exposure to naphthalene may cause eye and skin irritation. At slightly higher levels (above 10 ppm)..