Male Reproductive System

Male Reproductive System

High School

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Learning Objectives

• Identify the external and internal organs of the male reproductive system.

• Describe the path sperm travels from production to ejaculation.

• Explain the process of making sperm and the role of testosterone in male development.

• List methods for maintaining reproductive health and identify common health issues.

Key Vocabulary

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Sperm

A tiny male cell that unites with a female ovum to form a fertilized egg or zygote.

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Testosterone

The primary male sex hormone responsible for puberty and stimulating sperm production in males.

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Semen

A thick fluid that contains millions of sperm and other fluids produced by male sex organs.

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Scrotum

An external skin sac that holds the testicles and regulates their temperature for sperm production.

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Spermatogenesis

The specific process of sperm cell production which takes place inside the testes of a male.

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Ejaculation

The action of ejecting semen from the body through the urethra during a sexual climax.

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Functions & External Organs

• This system produces, maintains, and transports sperm, semen, and male sex hormones.

• ​The testes are glands in the scrotum that produce sperm and testosterone.

• The scrotum is an external skin sac that helps control the testes' temperature.

• The penis delivers sperm to the female reproductive tract and releases urine.

Multiple Choice

What is the primary role of the scrotum?

• To produce sperm and testosterone.

• To maintain the appropriate temperature for sperm production.

• To deliver sperm into the female reproductive tract.

• To produce and secrete male sex hormones.

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Internal Reproductive Organs

• The vas deferens is a muscular tube that transports sperm from the epididymis.

• Seminal vesicles produce a fluid rich in fructose to nourish and mobilize sperm.

• The prostate gland secretes a milky fluid that helps to activate the sperm.

• Cowper's glands produce mucus that lubricates the urethra and neutralizes any acidic urine.

Multiple Choice

Which gland produces a fluid to neutralize the acidic environment of the urethra before ejaculation?

• Prostate Gland

• Cowper's Gland

• Testes

• Seminal Vesicles

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Spermatogenesis and the Path of Sperm

Spermatogenesis

• Sperm production occurs in the seminiferous tubules, which are located inside the testes.

• The process begins with stem cells called spermatogonia that undergo meiotic division.

• This process produces haploid spermatids, which then mature to become sperm cells.

Path of Sperm

• Sperm mature in the epididymis and are expelled into the vas deferens.

• Fluid from the seminal vesicles is added to the sperm for nourishment.

• More fluids are added to create semen, which is expelled through the urethra.

Multiple Choice

Where do sperm mature and get stored after being produced in the seminiferous tubules?

• In the seminal vesicles

• In the epididymis

• In the prostate gland

• In the vas deferens

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The Role of Testosterone in Puberty

• Puberty is a rapid growth period for males, starting around ages 12 to 15.

• The hormone testosterone increases, causing the development of secondary sexual characteristics.

• Changes include broader shoulders, muscle growth, facial/body hair, and a deeper voice.

• It also controls sex organ growth and the production and maturation of sperm.

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Multiple Choice

Which of the following is NOT a secondary sexual characteristic initiated by testosterone?

• Growth of facial hair

• Broadening of shoulders

• Deepening of the voice

• Production of sperm

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Reproductive Health and Common Problems

• Maintain good health through daily bathing and monthly testicular self-examinations for lumps.

• An inguinal hernia occurs when the intestine pushes through the abdominal wall.

• Sterility, the inability to reproduce, can be caused by producing few sperm.

• Testicular cancer affects young men, while prostate cancer is common in older men.

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Multiple Choice

According to the slide, which problem is most common in males between the ages of 14 and 40?

• Prostate Cancer

• Sterility

• Testicular Cancer

• Inguinal Hernia

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Common Misconceptions about the Male Reproductive System

Misconception	Correction
Urine and semen can exit the urethra simultaneously.	Internal muscles prevent urine and semen from exiting at the same time.
A vasectomy affects a man's sex drive or ability to have an erection.	It only blocks sperm transport and does not affect hormones or erections.
Circumcision removes the head of the penis.	It is the removal of the foreskin, not the head of the penis.
Testicular cancer is a disease that only affects older men.	It is one of the most common cancers in males aged 14 to 40.

Multiple Choice

Why is the location of the scrotum outside the main body cavity crucial for the male reproductive system?

• To allow for easier transport of sperm to the urethra.

• To protect the testes from physical injury.

• To make self-examinations easier to perform.

• To keep the testes at a temperature optimal for sperm viability.

Multiple Choice

What is the functional difference between the fluid produced by the seminal vesicles and the fluid from the Cowper's gland?

• Seminal fluid nourishes sperm, while Cowper's fluid lubricates and neutralizes the urethra.

• Seminal fluid activates sperm, while Cowper's fluid nourishes it.

• Seminal fluid lubricates the urethra, while Cowper's fluid activates sperm.

• Seminal fluid and Cowper's fluid have the exact same function.

Multiple Choice

A male is diagnosed with a condition where his primary spermatocytes cannot complete meiosis. Predict the most direct consequence of this condition.

• He will be unable to form haploid spermatids and mature sperm.

• He will be unable to get an erection.

• Semen will not be able to exit the urethra.

• He will not produce testosterone.

Multiple Choice

Analyze the path of sperm and explain why a blockage in the epididymis would lead to sterility, even if the testes are producing healthy sperm.

• Because the sperm would not be mixed with fluid from the seminal vesicles.

• Because sperm would be unable to mature and be stored for ejaculation.

• Because testosterone production would be halted.

• Because the sperm would be unable to receive nutrients from the prostate gland.

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Summary

• The system produces sperm and hormones, and is responsible for sperm delivery.

• External organs include the penis, scrotum, and testes.

• Internal organs like the vas deferens create and transport semen.

• Testosterone drives puberty; good hygiene is critical for reproductive health.

Poll

On a scale of 1-4, how confident are you about the concepts covered in today's review?

• 1

• 2

• 3

• 4