coordination and control

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  • coordination and control
    • responding to change
      • the nervous system uses electrical impulses to enable you to react quickly to your surroundings and coordinate what you do
      • cells called receptors detect stimuli
      • like all animal cells , light receptor cells and other receptors have a nucleus, cytoplasm and cell membrane
      • impulses from receptors pass along the sensory neuron to the brain or spinal cord . impulses are sent along the motor neuron from the brain to effector organs
    • reflex actions
      • some responses to stimuli are automatic and rapid and are called reflex actions
      • reflex actions run everyday bodily functions and help you avoid danger
    • hormones and the menstrual cycle
      • hormones control the release of an egg from the ovary and build up the lining of the womb during the menstrual cycle
      • some of the hormones involved are fsh from the pituitary gland and estrogen from the ovary
    • the artificial control of fertility
      • hormones can be used to control retility
      • oral contraception contains hormones that stop FSH production so no eggs mature
      • FSH can be used as a fertility drug for women to stimulate eggs to mature in their ovaries, these eggs can be used in IVF treatments
    • controlling conditions
      • humans need to maintain a constant internal environment , controlling levels of water, ions and blood sugar as well as temperature
      • homeostasis is the result of the coordination of your nervous system , your hormones and your body organs
    • hormones and the control of plant growth
      • plants are sensitive to light , moisture and gravity
      • plants responses are brought about bu plant hormones (auxin)
      • the responses of roots and shoots to stimuli such as light and gravity are the result of an uneven distribution of auxin
      • we can use plant growth hormones as weed killers and rooting hormones on cutting
    • using hormones
      • there are benefits and problems associated with the use of hormones to control fertility and these must be evaluated carefully
      • plant hormones are very useful as weed killers but their use can damage the environment


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