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A close-up of a person writing with a silver pen on a small spiral notebook placed on a wooden table. One hand holds the pen while the other hand points to the paper. The writing is blurred and not readable.

Diagram of the lower digestive tract showing the large bowel, rectum, transitional zone, anal canal, internal and external sphincters, anal margin, and anus. Labels point to each structure.

What is the Anus?

(Source: Cancer Research UK )

Male Reproductive System

Four teenage boys sit on a brick ledge outside a building, smiling and laughing. Three wear graphic t-shirts, and one is drinking from a cup. Their relaxed, cheerful poses suggest friendship and fun.

What is Puberty?

Puberty is the process in which a human child’s body matures into an adult capable of sexual reproduction. It is initiated by hormonal signals from the brain to the ovaries in females and testes...

Male Reproductive System

Medical illustration of the male reproductive system, labeling the bladder, ureter, seminal vesicles, prostate, vasa deferentia, urethra, bulbourethral gland, epididymides, and testes, highlighting a vasectomy.

What is a Vasectomy?

(Image courtesy of K. D. Schroeder )

Male Reproductive System

A 3D illustration of a green mitochondrion, showing its oval shape and folded inner membrane called cristae, set against a white background.

What are Mitochondria?

Mitochondria are known as the powerhouses of the cell as they are responsible for cell respiration (the process which produces energy). Learn more about these amazing organelles in this primer.

Male Reproductive System

Ball-and-stick model of an adenosine triphosphate (ATP) molecule, showing colored spheres representing atoms and bonds, including three phosphate groups, ribose sugar, and adenine base.

What is Adenosine Triphosphate (ATP)?

Adenosine triphosphate (ATP) is the primary energy storage molecule used to activate the reactions needed for growth and reproduction by all living organisms. Learn more about this key aspect of reproduction in this primer.

Male Reproductive System

A person sitting at a desk and working on a laptop, surrounded by books and papers, with a coffee mug nearby. Shelves filled with books are in the background.

What is Testosterone?

(Image courtesy of Aethyta, Public domain, via Wikimedia Commons )

Male Reproductive System

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