Human reproduction

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The male reproductive organs are the . The female reproductive organs are the . By in the human these have developed with the other male and female reproductive organs. The female gamete develops during a cycle called the cycle, which lasts about days. During the cycle, the lining of the womb . Around day of the cycle, a female gamete () is released. The days around this time are called the period. If sexual intecourse takes place at this time, and a male gamete () meets the female gamete, may take place. Fertilisation is the fusion of the sperm and egg to form a , and it takes place in the . The zygote undergoes cell division and develops within the . It develops during pregnancy into a . At the end of the pregnancy which lasts about weeks, the birth of a baby takes place. If fertilisation does NOT take place within the cycle, the lining falls away and leaves the body - this is called , and marks the beginning of the next cycle. There are many methods of preventing reproduction, called . Some of these prevent fertilisation e.g. barrier methods that prevent the sperm meeting the egg, or chemical method that prevent production of the egg.