Reproductive System

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Reproduction is the process by which living organisms produce individuals of their own kind. It helps continue the species and increases the number of individuals.

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Asexual reproduction is the production of offspring from a single organism without the formation of gametes. It is common in bacteria, protists, lower plants, and lower animals.

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Sexual reproduction is the production of offspring by the formation and fusion of gametes. The male and female gametes unite to form a zygote, which later develops into a mature organism.

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Puberty is the stage when changes occur in boys and girls between the ages of 10 and 14 years due to hormones. During this stage, the body grows rapidly and reproductive organs become mature.

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Adolescence is the period from 10 to 19 years of age. It includes physical and psychological changes and is marked by the development of secondary sexual characters.

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The scrotum keeps the testes about 2-3°C lower than body temperature. This lower temperature is suitable for sperm development.

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Testis is the male gonad because it produces the male gamete, the sperm. In an adult male, each testis is about 4-5 cm long and weighs about 12 g.

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Sperms are produced in highly coiled seminiferous tubules. Each lobule of the testis has 2-3 seminiferous tubules.