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The Male Reproductive System. Reproduction: One of the essential functions of living organisms Results from the union of 2 specialized sex cells, one from each, the male and female Structure & function of the male reproductive system Includes both internal & external organs

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the male reproductive system

The Male Reproductive System

Reproduction:

One of the essential functions of living organisms

Results from the union of 2 specialized sex cells, one from each, the male and female

Structure & function of the male reproductive system

Includes both internal & external organs

2 main biological functions of male reproduction

Production and storage of sperm(male reproductive cells)

Transfer sperm into female’s body

structure function of the male reproductive system
Structure & function of the male reproductive system
  • Puberty:
  • Rapid growth & sexual maturity period-(between ages 12-15)
  • Reproduction system becomes fully functional
  • Hypothalamus:
  • Begins puberty
  • Regulates pituitary gland secretions
  • Pituitary Gland:
  • Releases hormones to stimulate production of testosterone
  • Testosterone:
  • Initiates physical changes (secondary sex characteristics)
  • Broadening of shoulders Bigger muscles
  • Facial/body hair Deepening of voice
  • Causes production of sperm( capable of producing sperm for the rest of his life)
external male reproductive organs
External Male reproductive organs
  • Testes:
  • Small glands that produce sperm
  • Scrotum:
  • Sac that holds testes outside the body
  • Protects sperm by keeping testes at a temperature below normal body temp
  • Sperm production requires a lower temp (heat sensitive)
  • About 5 degrees below normal body temp
  • Tight clothing can interfere with sperm production
  • Penis:
  • Male sex organ
  • Spongy erectile tissue with many blood vessels
external male reproductive organs1
External Male reproductive organs
  • Penis: (continued)
  • AnErectionis caused by increased blood flow to the penis
  • During Ejaculation, muscular contractions occur causing semen to be emitted
  • Semen- contains sperm & other secretions from reproduction organ
  • Nocturnal emissions- when a male begins to produce sperm, he may experience ejaculations when sperm is released during sleep
  • Circumcision- Surgical removal of the foreskin of the penis
  • 55-65% of newborns in the US
  • 20% worldwide
  • Performed for cultural, religious, my genetic reasons
  • Performed usually during first 10 days (often 48 hours after birth)
internal male reproductive organs
Internal male reproductive organs
  • Play a role in the delivery of sperm
  • Epididymus: Temporary storage of sperm
  • Sperm mature there
  • Located on the outer surface of the testes
  • Vas Deferens: pair of connecting tubes that extend from the epididymus to the urethra
  • In the urethra, sperm mix with fluids from 3 other internal sex organs to produce seminal fluid (protects & nourishes sperm)
  • Seminal Vesicles:provides a nourishing fluid
  • Prostate Gland & Cowper’s Gland
  • Neutralizes acidic environment of females vagina
  • Acts as a lubricant for sperm as it goes through the urethra
  • Urethra: Passage way through which both semen and urine leave the body
during ejaculation
During Ejaculation
  • 20- 150 million sperm are released
  • Most are killed by acidic environment of the vagina
  • Only about 50-1000 sperm will actually reach the egg
  • However, men that have a low sperm count-below 20 million released
  • Sperm make up only 10% of semen
  • 90% is fluid secreted by the 3 glands
care of the male reproductive system
Care of the male reproductive system
  • Regular check ups
  • Bath regularly
  • Protective equipment during PA or sports
  • Self examinations monthly
  • Abstinence is the key
problems with the male reproductive system
Problems with the male reproductive system
  • Organs of the reproductive system can be affected by functional and/or structural problems
  • STD’s
  • Chlamydia, Gonorrhea, Syphilis (bacterial)
  • Genital Herpes: Viral
  • HPV: Viral
  • If left untreated, all can damage internal organs and certain types lead to cancer of the anus and penis
problems with the male reproductive system1
Problems with the male reproductive system
  • Hernia: when part of and organ pushes through an opening of a membrane or muscle that contains an organ
  • Usually part of the intestines is pushed through the muscle near the scortum
  • Sterility: Condition where a person is unable to reproduce
  • Result of too few sperm
  • Environmental hazards (radiation, chemical exposure, smoking, STD complications, temp change exposure to x-rays)
  • Enlarged Prostate: Surrounds urethra
  • Can enlarge because of: infection, tumor, old age
  • Squeezes urethra resulting in frequent or difficult urination
  • Cancer of the prostate: Early detection is very important
  • Often site for older males
  • Only a doctor can diagnose prostate cancer
  • Cancer of the testes:
  • Usually slight enlargement
  • No pain or dull ache
  • Hard lumps
  • Can be cured 90% of the time if caught early