The Male Reproductive The Male Reproductive SystemSystem

Human Sexuality UnitHuman Sexuality Unit

Lesson 2Lesson 2

PubertyPuberty

TestosteroneTestosterone• Hormone that produces male secondary Hormone that produces male secondary

sex characteristicssex characteristics• Causes physical and emotional changesCauses physical and emotional changes

Ex.: anger, insecurity, sexual feelingsEx.: anger, insecurity, sexual feelings

Physical ChangesPhysical Changes

Occur between 12-15 years oldOccur between 12-15 years old Growth spurt occurs later in males Growth spurt occurs later in males

than femalesthan females Males mature at a different rate than Males mature at a different rate than

femalesfemales

Secondary Sex Characteristics in Secondary Sex Characteristics in MalesMales

Increase in heightIncrease in height Longer and heavier bonesLonger and heavier bones Broader shouldersBroader shoulders Thicker and tougher skinThicker and tougher skin Deepened voiceDeepened voice Growth of facial, pubic, and body hairGrowth of facial, pubic, and body hair Enlargement of penis, scrotum, and testesEnlargement of penis, scrotum, and testes Formation of spermFormation of sperm

Male Reproductive SystemMale Reproductive System

Organs in males involved in Organs in males involved in producing offspringproducing offspring

External OrgansExternal Organs

PenisPenis• Male sex organ used for reproduction and Male sex organ used for reproduction and

urinationurination ScrotumScrotum

• Sac-like pouch that holds testesSac-like pouch that holds testes• Helps regulate testes temperatureHelps regulate testes temperature• Hangs from body so testes have a lower Hangs from body so testes have a lower

temperature than rest of bodytemperature than rest of body• Allows testes to produce spermAllows testes to produce sperm

SpermSperm• Male reproductive cellsMale reproductive cells

Internal OrgansInternal Organs

TestesTestes• Glands that produce sperm cells and Glands that produce sperm cells and

testosteronetestosterone Seminiferous tubulesSeminiferous tubules

• Network of coiled tubes where sperm is Network of coiled tubes where sperm is producedproduced

• Spermatogenisis = process by which Spermatogenisis = process by which sperm is producedsperm is produced

Internal OrgansInternal Organs

EpididymisEpididymis• Structure where sperm matureStructure where sperm mature• Located on upper rear surface of testesLocated on upper rear surface of testes• Some sperm is stored hereSome sperm is stored here

Vas deferensVas deferens• Two long, thin tubes – passageway for spermTwo long, thin tubes – passageway for sperm• Sperm storageSperm storage• Extend from epididymis to the abdomenExtend from epididymis to the abdomen• Help transport sperm (cilia)Help transport sperm (cilia)

Internal OrgansInternal Organs

Seminal vesiclesSeminal vesicles• Two small glands – secrete fluid to help Two small glands – secrete fluid to help

sperm movesperm move Prostate glandProstate gland

• Produces fluid to help keep sperm aliveProduces fluid to help keep sperm alive• Located beneath bladderLocated beneath bladder• Secretion helps neutralize acidic Secretion helps neutralize acidic

environment (w/o this secretion, many environment (w/o this secretion, many sperm would die)sperm would die)

Internal OrgansInternal Organs

Cowper’s glandsCowper’s glands• Two small glands – secrete a clear, lubricating Two small glands – secrete a clear, lubricating

fluid into the urethrafluid into the urethra• ““Pre-ejaculation” – may contain spermPre-ejaculation” – may contain sperm

UrethraUrethra• Passageway for sperm and urine to leave the Passageway for sperm and urine to leave the

bodybody SemenSemen

• Mixture of sperm and fluids from the seminal Mixture of sperm and fluids from the seminal vesicles, prostate gland, and Cowper’s glandsvesicles, prostate gland, and Cowper’s glands

Male Reproductive SystemMale Reproductive System

ErectionErection• Process where penis swells with blood Process where penis swells with blood

and elongatesand elongates• May be accompanied by ejaculationMay be accompanied by ejaculation

Ejaculation: passage of semen from penis – Ejaculation: passage of semen from penis – result of a series of muscular contractionsresult of a series of muscular contractions

Penis returns to a non-erect state after Penis returns to a non-erect state after ejaculationejaculation

Protecting Reproductive HealthProtecting Reproductive Health

Keep external organs clean – prevent Keep external organs clean – prevent infection and odorinfection and odor

Perform testicular self-examinationsPerform testicular self-examinations Wear protective clothing and equipment Wear protective clothing and equipment

during sports and physical activitiesduring sports and physical activities Regular medical checkups Regular medical checkups Seek medical attention when you show Seek medical attention when you show

signs of infection or irregularitysigns of infection or irregularity Choose safe sexual habitsChoose safe sexual habits