Control in Humans and Plants

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  • Control in Humans and Plants
    • Menstrual cycle (28 days)
      • Hormones involved (Fall Out Lady) FOL. FSH, Oestrogen, LH
        • FSH- matures the egg, stimulates production of Oestrogen
          • Secreted from the pituitary gland
        • Oestrogen- thickens the lining of the womb, inhibits(stops) the production of FSH, stimulates production of LH
          • FSH- matures the egg, stimulates production of Oestrogen
            • Secreted from the pituitary gland
          • Secreted from the ovaries
        • LH- releases the egg
          • Oestrogen- thickens the lining of the womb, inhibits(stops) the production of FSH, stimulates production of LH
            • Secreted from the ovaries
          • Secreted from the pituitary gland
    • Oral Contraceptives (stops pregnancy)
      • First types of contraceptive contained high doses of Oestrogen- egg could not mature
        • Caused significant side effects
      • Oral contraceptives may contain oestrogen and progesterone to inhibit egg maturation
      • birth-control pills now contain a much lower dose of oestrogen, or are progesterone only
        • progesterone-only pills lead to fewer side effects
    • IVF
      • Women given fertility drug containing FSH and LH- stimulated mature egg to be released
        • The eggs are collected from the mother and fertilised by sperm from the father.
          • The fertilised eggs develop into embryos. At the stage when they are tiny balls of cells, one or two embryos are inserted into the mother’s uterus
    • In shoots auxin increases growth. In roots auxin slows down growth
    • Uses of plant hormones in agriculture
      • Weed killers contain many auxins which encourage growth. The growth is too rapid and the weeds die
      • Rooting hormones encourage plant cutting to grow roots. sSo you can grow an identical plant from a cutting

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