Male Male Reproductive Reproductive SystemSystem

What the Male Reproductive What the Male Reproductive System DoesSystem Does

Main function is to produce sperm and Main function is to produce sperm and deliver it to the female reproductive deliver it to the female reproductive systemsystem

How the Male Reproductive How the Male Reproductive System WorksSystem Works

Male PubertyMale Puberty

Starts at around age 12-13Starts at around age 12-13 Hormonal changes stimulate an increase in Hormonal changes stimulate an increase in

growth rate, alterations in behavior, growth rate, alterations in behavior, enlargement of the genitals, and the enlargement of the genitals, and the appearance of secondary sexual appearance of secondary sexual characteristics such as facial hair. characteristics such as facial hair.

Because boys begin their final growth spurt Because boys begin their final growth spurt later than girls, they have a longer period of later than girls, they have a longer period of steady growth and usually attain a greater steady growth and usually attain a greater adult height. adult height.

Male PubertyMale Puberty

Changes that occur:Changes that occur: Growth spurt occursGrowth spurt occurs Acne may appearAcne may appear Larynx enlarges, voice Larynx enlarges, voice

deepensdeepens Facial hair appearsFacial hair appears Shoulders broadenShoulders broaden Underarm hair appearsUnderarm hair appears Perspiration increasesPerspiration increases

Some breast enlargement Some breast enlargement may occurmay occur

Muscles developMuscles develop Pubic hair appearsPubic hair appears External genitals enlargeExternal genitals enlarge Sperm production beginsSperm production begins First ejaculation occursFirst ejaculation occurs Long bone growth stopsLong bone growth stops

SpermSperm Sex cells that are Sex cells that are

produced in the testes produced in the testes and are used to and are used to fertilize the eggfertilize the egg

Sperm swim at the Sperm swim at the rate of 1-4mm per rate of 1-4mm per minute or 60-240mm minute or 60-240mm per hourper hour

50,000 sperm are 50,000 sperm are produced each produced each MINUTE in mature MINUTE in mature menmen

Testicles (testes)Testicles (testes) Male reproductive Male reproductive

organ that makes organ that makes sperm and sperm and testeronetesterone

Male begin Male begin producing 100+ producing 100+ million sperm a million sperm a day once they day once they reach pubertyreach puberty

Seminiferous TubulesSeminiferous Tubules

Tightly coiled tubes inside the testes Tightly coiled tubes inside the testes where sperm are madewhere sperm are made

TestosteroneTestosterone

The male sex hormone that influences The male sex hormone that influences sperm productionsperm production

During puberty, testosterone causes During puberty, testosterone causes facial and body hair to grow, shoulders to facial and body hair to grow, shoulders to broaden and voice to deepenbroaden and voice to deepen

ScrotumScrotum The skin covered The skin covered

sac that the testes sac that the testes rest inrest in

Muscles of the Muscles of the scrotum help with scrotum help with temperature controltemperature control

Sperm develop best Sperm develop best several degrees several degrees below 98.6below 98.6

PenisPenis The external male The external male reproductive organ that reproductive organ that is made up of spongy is made up of spongy tissue that has blood tissue that has blood flow going through itflow going through it

The penis removes The penis removes urine from the bladder urine from the bladder and also delivers sperm and also delivers sperm to the female to the female reproductive systemreproductive system

The glans is the The glans is the sensitive nerve ending sensitive nerve ending near the tip of the penisnear the tip of the penis

ForeskinForeskin

A piece of skin that partially covers the tip A piece of skin that partially covers the tip of the penis at birthof the penis at birth

Circumcision is the Circumcision is the removal of the removal of the foreskin from the tip foreskin from the tip of the penisof the penis

ErectionErection

When the penis becomes hard and firmWhen the penis becomes hard and firm The blood vessels in the penis fill with The blood vessels in the penis fill with

bloodblood The penis must be erect in order for The penis must be erect in order for

ejaculation to occurejaculation to occur

EjaculationEjaculation

When sperm are released from the penisWhen sperm are released from the penis One ejaculation contains 40-300 million One ejaculation contains 40-300 million

spermsperm It is normal for a male to ejaculate during It is normal for a male to ejaculate during

sleep, this is called nocturnal emissions sleep, this is called nocturnal emissions or “wet dreams” or “wet dreams”

UrethraUrethra Urine passes Urine passes

through the urethra, through the urethra, a tube that starts at a tube that starts at the bladder and the bladder and ends at the opening ends at the opening of the penisof the penis

Sperm also pass Sperm also pass through the urethra through the urethra during ejaculation during ejaculation but not at the same but not at the same time as urine is time as urine is carriedcarried

EpididymisEpididymis A tightly coiled tube where sperm mature A tightly coiled tube where sperm mature

as they pass throughas they pass through The epididymis can be up to 700 feet The epididymis can be up to 700 feet

longlong

Vas DeferensVas Deferens The next portion The next portion

of a hollow tube of a hollow tube that sperm pass that sperm pass throughthrough

The vas deferens The vas deferens can be up to 12 can be up to 12 inches longinches long

VasectomyVasectomy

The severing and tying off of the vas The severing and tying off of the vas deferensdeferens

Once the vas deferens is severed, sperm Once the vas deferens is severed, sperm will not be able to be ejaculated out of the will not be able to be ejaculated out of the penispenis

Seminal VesiclesSeminal Vesicles Found near the base of the urinary bladderFound near the base of the urinary bladder Produce thick secretions that nourish the Produce thick secretions that nourish the

sperm and help sperm move easiersperm and help sperm move easier

Prostate GlandProstate Gland Encircles the urethra near the bladderEncircles the urethra near the bladder About the size of a walnutAbout the size of a walnut Secretes a thin, milky fluid that protects Secretes a thin, milky fluid that protects

the sperm from acid in the female the sperm from acid in the female reproductive systemreproductive system

Cowper’s GlandCowper’s Gland Found near urethra Found near urethra

below the prostatebelow the prostate

Prior to ejaculation Prior to ejaculation this gland secretes this gland secretes a clear fluid that a clear fluid that protects the sperm protects the sperm from acid in the from acid in the male urethramale urethra

BladderBladder A triangular sac that stores urine before it A triangular sac that stores urine before it

is excreted out of the bodyis excreted out of the body

Sphincter ValveSphincter Valve

A small piece of skin, a muscle that holds A small piece of skin, a muscle that holds back urine or semen so that both do not back urine or semen so that both do not come out of the body at the same timecome out of the body at the same time

Prostate ExamProstate Exam

An examination that is performed to identify An examination that is performed to identify any irregularities in the prostateany irregularities in the prostate

Exams help in early detection of prostate Exams help in early detection of prostate cancercancer

Prostate cancer occurs primarily in older males Prostate cancer occurs primarily in older males and is the 2and is the 2ndnd most common cancer in males in most common cancer in males in the U.Sthe U.S

For every 3 men diagnosed with cancer this For every 3 men diagnosed with cancer this year 1 will have prostate cancer.year 1 will have prostate cancer.

Testicular ExamTesticular Exam

A self exam that men should perform A self exam that men should perform once per month once they have reached once per month once they have reached puberty to detect any lumps, swelling, puberty to detect any lumps, swelling, pain, or discomfort in the scrotum or pain, or discomfort in the scrotum or abdomenabdomen

Path of SpermPath of Sperm

TestesTestes EpydidimisEpydidimis

Vas deferensVas deferens Prostate GlandProstate Gland Seminal VesicleSeminal Vesicle Sphincter ValveSphincter Valve

UrethraUrethra Ejaculated out of BodyEjaculated out of Body

Path of SpermPath of Sperm

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