B11 : hormonal coordinaton

• Hormone


  A chemical in the body that can cause a change in your cells
• Hormones


  • They are often longer lasting than the nervous system
  • The response often takes longer to come into play
• Glands that make up the endocrine system

  • Hypothalamus
  • Pituitary gland
  • Thyroid gland
  • Adrenal glands
  • Pancreas
  • Ovaries
  • Testes
• Negative feedback loop

  The body detects a change in the environment, triggers a hormonal response to lower or raise the level back to the ideal homeostasis
• Type 1 diabetes


  Condition where the pancreas doesn't produce enough insulin
• Type 2 diabetes


  Condition where the body stops responding to insulin, often caused by obesity and high sugar diet
• Menstrual cycle

  1. Days 1-7: Menstruation

  2. Days 8-13: Estrogen increases

  3. Day 14: Ovulation (FSH and LH)

  4. Days 22-23: Progesterone increases
• Contraceptive methods

  • Barrier (condoms, caps)
  • Chemical (pill, spermicides, IUD)
  • Abstinence
• IVF

  Fertilization that happens outside the body, using hormones to facilitate conception
• Auxins

  Growth hormones in plants that cause phototropism and gravitropism
• Plant hormones used by farmers

  • Auxins (in fertilizers and weedkillers)
  • Gibberellins (to speed up germination)
  • Ethene (to ripen bananas)