coordination and control
- Created by: meganbeaney
- Created on: 19-05-15 17:08
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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
- responding to change
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