Human Reproductive System

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Human Reproductive System

• How we the species survives

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Standard 5d

• Students know HOW the reproductive organs of the
  human
• female and male generate eggs and sperm.

• Students know HOW sexual activity MAY lead to
  fertilization
• and pregnancy.

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OBJECTIVE

• Students will be able to understand and
• explain by verbal, written, and graphical
• means how male and female sex cells
• are made.

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WHY SHOULD YOU CARE?

• To help you understand the CHANGES that go on
• in your body as you reach puberty, and adulthood

• For girls, learning this stuff will lower your
  chances of becoming
• ACCIDENTALLY pregnant!

For boys, learning this stuff will lower your
chances of being new dad by ACCIDENT!
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Male Sex Cell SPERM
Spermatogenesis Process by which sperm is
produced
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Male Reproductive System
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Male Reproductive Tract

• Testes - male gonad
• located externally in scrotum
• produce sperm
• produce male hormone - testosterone

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Male Reproductive Tract

• Testes - male gonad

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Scrotum

• thermal regulatory organ
• temperature control necessary for sperm
  production
• cannot occur at body temperature

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Scrotum

• heat can cause infertility
• spermatogenesis - maturation of sperm cells -
  takes about 50 days

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Epididymis

• 10 - 15 days for the sperm cells to pass through
  the epididymis
• Functions -
• maturation of sperm cells
• storage of sperm cells

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Vas Deferens

• passageway for sperm cells

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Accessory Glands

• Seminal Vesicles
• Prostate Gland
• Cowpers gland

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Accessory Glands

• Provide 95-98 of total ejaculate volume

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Seminal Vesicles

• secrete fructose - energy source for sperm
• 40-80 of ejaculate volume

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Prostate Gland

• secretes enzymes
• 15-30 of ejaculate volume

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Cowpers Gland

• cleanse and neutralize urethra
• keep sperm from dying

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Urethra

• passageway for semen
• carries semen to the end of the penis

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Retractor Muscle

• retracts penis
• pulls the penis back within the sheath

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Sigmoid Flexor

• extends penis from the sheath

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Penis

• deposits semen in the female reproductive tract

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Sheath

• encloses the penis
• not present in primates

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Hormones

• testosterone
• functions
• stimulate spermatogenesis
• maturation of sperm cells

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Hormone functions

• development of accessory sex glands
• Libido - sex drive
• builds muscle
• Responsible for male characteristics