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Male Reproductive System

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Male Reproductive System * * Basic Anatomy Testes (gonads) Encased within scrotum and stored outside body Scrotum expands and contracts to heat and cool the testes ... – PowerPoint PPT presentation

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Title: Male Reproductive System


1
Male Reproductive System
2
Basic Anatomy
  • Testes (gonads)
  • Encased within scrotum and stored outside body
  • Scrotum expands and contracts to heat and cool
    the testes keeping them at a temp. slightly less
    than body temp
  • This is the optimal temp for sperm formation.
  • Seminiferous Tubules
  • 250 m long network of highly coiled tubes within
    testes which produce sperm
  • Epididymis
  • Extension of sem. tubules, where the sperm are
    stored and reach final maturation

3
Basic Anatomy
  • Penis
  • Delivery mechanism for sperm also part of
    urinary tract
  • Vas Deferens
  • Sperm duct how sperm get from the epidymis to
    the urethra
  • Urethra
  • shared with urinary tract allows sperm to move
    through the penis
  • Several glands will add liquids to the sperm to
    form semen
  • Seminal Vesicle
  • Injects fructose for energy
  • Prostate Gland
  • Injects an alkaline (basic) fluid which
    neutralizes acidity of vagina
  • Cowpers Gland
  • Injects a white mucous-like fluid which clumps
    the sperm together for a short period after
    ejaculation

4
Basic Anatomy The Brain
  • Pituitary Gland
  • Hypothalamus

5
Basic Hormones
  • GnRH - Gonaditropin Releasing Hormone
  • Secreted by the hypothalamus (at the base of the
    brain next to the pituitary gland)
  • Causes the pituitary gland to increase production
    of FSH and LH
  • FSH - Follicle Stimulating Hormone
  • Secreted by the pituitary gland
  • Stimulates the cells in the testes to divide and
    become sperm
  • Released constantly enabling males to produce
    around 400 million (estimates vary widely) sperm
    per day
  • LH - Lutenizing Hormone
  • Secreted by the pituitary gland
  • Stimulates the testes to produce androgens (like
    testosterone)

6
A Natural Steroid Hormone
  • Testosterone
  • Secreted by the testes it stimulates
  • The development of the penis and testes
  • The deepening of the voice during puberty
  • Muscle size and strength
  • Bone growth and strength
  • Sex drive (libido)
  • Sperm production

7
What are illegal steroids?
  • Steroids can be natural or synthetic and are
    often referred to as
  • Anabolic substances promote growth of skeletal
    muscle
  • Androgenic substances promote development of
    male sexual characteristics.
  • Use of steroids can have severe and lasting side
    effects
  • Shrinking of the testicles
  • Reduced sperm count/infertility and impotence
  • Baldness
  • Difficulty or pain in urinating
  • Aggressive behaviors, rage or violence
  • Severe acne
  • Liver disease
  • High cholesterol
  • Anxiety
  • Stunted growth (bones stop lengthening)
  • Who is most likely to use steroids?
  • Most steroid users are males between the ages of
    11 and 18

8
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