The Male Reproductive System Human Sexuality Unit Lesson 2

Puberty Testosterone Testosterone Hormone that produces male secondary sex characteristicsHormone that produces male secondary sex characteristics Causes physical and emotional changesCauses physical and emotional changes Ex.: anger, insecurity, sexual feelings Ex.: anger, insecurity, sexual feelings

Physical Changes Occur between years old Occur between years old Growth spurt occurs later in males than females Growth spurt occurs later in males than females Males mature at a different rate than females Males mature at a different rate than females

Secondary Sex Characteristics in Males Increase in height Increase in height Longer and heavier bones Longer and heavier bones Broader shoulders Broader shoulders Thicker and tougher skin Thicker and tougher skin Deepened voice Deepened voice Growth of facial, pubic, and body hair Growth of facial, pubic, and body hair Enlargement of penis, scrotum, and testes Enlargement of penis, scrotum, and testes Formation of sperm Formation of sperm

Male Reproductive System Organs in males involved in producing offspring Organs in males involved in producing offspring

External Organs Penis Penis Male sex organ used for reproduction and urinationMale sex organ used for reproduction and urination Scrotum Scrotum 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 temperature than rest of bodyHangs from body so testes have a lower temperature than rest of body Allows testes to produce spermAllows testes to produce sperm Sperm Sperm Male reproductive cellsMale reproductive cells

Internal Organs Testes Testes Glands that produce sperm cells and testosteroneGlands that produce sperm cells and testosterone Seminiferous tubules Seminiferous tubules Network of coiled tubes where sperm is producedNetwork of coiled tubes where sperm is produced Spermatogenisis = process by which sperm is producedSpermatogenisis = process by which sperm is produced

Internal Organs Epididymis Epididymis 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 deferens Vas 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 Organs Seminal vesicles Seminal vesicles Two small glands – secrete fluid to help sperm moveTwo small glands – secrete fluid to help sperm move Prostate gland Prostate gland Produces fluid to help keep sperm aliveProduces fluid to help keep sperm alive Located beneath bladderLocated beneath bladder Secretion helps neutralize acidic environment (w/o this secretion, many sperm would die)Secretion helps neutralize acidic environment (w/o this secretion, many sperm would die)

Internal Organs Cowper’s glands Cowper’s glands Two small glands – secrete a clear, lubricating fluid into the urethraTwo small glands – secrete a clear, lubricating fluid into the urethra “Pre-ejaculation” – may contain sperm“Pre-ejaculation” – may contain sperm Urethra Urethra Passageway for sperm and urine to leave the bodyPassageway for sperm and urine to leave the body Semen Semen Mixture of sperm and fluids from the seminal vesicles, prostate gland, and Cowper’s glandsMixture of sperm and fluids from the seminal vesicles, prostate gland, and Cowper’s glands

Male Reproductive System Erection Erection Process where penis swells with blood and elongatesProcess where penis swells with blood and elongates May be accompanied by ejaculationMay be accompanied by ejaculation Ejaculation: passage of semen from penis – result of a series of muscular contractions Ejaculation: passage of semen from penis – result of a series of muscular contractions Penis returns to a non-erect state after ejaculation Penis returns to a non-erect state after ejaculation

Protecting Reproductive Health Keep external organs clean – prevent infection and odor Keep external organs clean – prevent infection and odor Perform testicular self-examinations Perform testicular self-examinations Wear protective clothing and equipment during sports and physical activities Wear protective clothing and equipment during sports and physical activities Regular medical checkups Regular medical checkups Seek medical attention when you show signs of infection or irregularity Seek medical attention when you show signs of infection or irregularity Choose safe sexual habits Choose safe sexual habits