External male organ sex

The development of the reproductive systems begins soon after fertilization of the egg, with primordial gonads beginning to develop approximately one month after conception. Reproductive development continues in utero, but there is little change in the reproductive system between infancy and puberty. To become a male, an individual must be exposed to the cascade of factors initiated by a single gene on the male Y chromosome. Because females do not have a Y chromosome, they do not have the SRY gene. Without a functional SRY gene, an individual will be female.

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Human Reproductive System

Physiology of adult Homo sapiens - Reproductive apparatuses

The human male reproductive system contains these parts:. The two testes one of them is called a testis are contained in a bag of skin called the scrotum. The testes have two functions:. The sperm pass through the sperm ducts , and mix with fluids produced by the glands.
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Male Reproductive System

Birth Landmarks Links. The ability to reproduce is one of the unifying characteristics of all living things. Sexual reproduction produces offspring that are genetically different from their parents. Asexual reproduction produces offspring genetically identical to their parent.
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The images below illustrate the male and female body parts that are involved in sexual activity and reproduction. These body parts are also commonly referred to as genitals, reproductive organs, or sex organs. The male body has sexual organs both inside and outside the body. The internal organs include the epididymis, vas deferens, seminal vesicles, and prostate, and the external organs include the penis and testicles.
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