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Male Reproductive System

Introduces functions of the male reproductive system.

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Extension - Male Reproductive System

Why do men and women look different?

The features that make men unique from women, such as this man's beard, are controlled by the sex hormones. The production of the sex hormones is a key role of the male reproductive system.

The Male Reproductive System Functions

Dogs have puppies. Cats have kittens. All organisms reproduce, including humans. Like other mammals, humans have a body system that controls reproduction. It is called the reproductive system. It is the only human body system that is very different in males and females. The male and female reproductive systems have different organs and different functions.

The male reproductive system has two main functions:

  1. Producing sperm.
  2. Releasing testosterone into the body.

Sperm are male gametes, or reproductive cells. When a male gamete meets a female gamete, they can form a new organism. Sperm form when certain cells in the male reproductive system divide by meiosis. When they grow older, males produce millions of sperm each day.

Testosterone is the main sex hormone in males. Hormones are chemicals that control many body processes. Testosterone has two major roles:

  • During the teen years, testosterone causes the reproductive organs to mature. It also causes other male traits to develop. For example, it causes hair to grow on the face and allows for muscle growth (Figure below).
  • During adulthood, testosterone helps a man to produce sperm.

When a hormone is released into the body, we say it is "secreted." Testosterone is secreted by males, but it is not the only hormone that males secrete. Males also secrete small amounts of estrogen. Even though estrogen is the main female sex hormone, scientists think that estrogen is needed for normal sperm production in males.

Testosterone, the main sex hormone in males, allows men to build larger muscles than women.


  • gamete: Reproductive cell, such as sperm or egg.
  • meiosis: Process in cell division during which chromosome number is halved in order to produce gametes.
  • reproductive system: Organ system that produces gametes and secretes sex hormones.
  • sperm: Male gamete, or reproductive cell.
  • testosterone: Main sex hormone in males.


  • The main functions of the male reproductive system are to produce sperm and secrete testosterone.
  • Testosterone, the main sex hormone in males, causes the reproductive organs to mature and other male traits to develop.


Use the resource below to answer the questions that follow.

  1. What is the role of the testicles in reproduction? What temperature is needed for it to perform this function? How does the body try to regulate the temperature of the testicles?
  2. What is the role of the seminal vesicles?
  3. What is the role of the penis in reproduction?
  4. What does the bulbourethral gland do? When does this occur?


  1. What are the two main roles of the male reproductive system?
  2. Explain the jobs of testosterone in males.

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