Human biology KA1

• What are testes the site of?


  Sperm production

  Manufacture of the male sex hormone (testosterone)
• What is formed through meiosis in the tiny seminiferous tubules of the testes?


  Sperm
• Coiled tubes that are connected to the sperm duct


  Seminiferous tubules
• What is testosterone?


  Produced by interstitial cells, found between the seminiferous tubules

  Released into the blood stream
• What are interstitial cells?


  Any cells that lie in the spaces between the functional cells of the tissue
• What is the accessory gland?


  -Where the sperm is mixed with fluids produced by the accessory gland

  -the 2 main accessory glands are the prostate gland and seminal vesicles which nourish and stimulate sperm

  -Sperm plus these fluids is called semen
• what are the seminal vesicles?

  Males have a pair of seminal vesicles which secrete a liquid rich

  ssory

  in:

  and

  • fructose - a sugar with provides energy for mobility
  • prostaglandins - hormone like compound that stimulate contractions of the female reproductive system track which helps the sperm to move closer to the egg
• What is the prostate gland?

  Secrets a thin lubricanting liquid containing enzymes. The enzymes keeps the fluid at the optimum viscosity for sperm mobility.
• Semen is a milky liquid composed of:


  -sperm

  -fluid from seminal vesicles

  -fluid from prostate gland
• What is a developing egg?

  • formed by meiosis in the ovaries
  • each ovUm (egg) is surrounded by a devolving follicle which secretes estrogen and protects the ovum
• What is a corpus luteum?


  After the egg is released the follicle develops into a corpus luteum which secretes the human progesterone
• What is fertilisation?

  Mature ova are released into the oviduct where they may be fertilised by a sperm to form a zygote