Nerves + Hormones.


CNS= central nervous system includes brain and spinal cord.
Mind Map by ashangel.holmes, updated more than 1 year ago
Created by ashangel.holmes about 9 years ago

Resource summary

Nerves + Hormones.
  1. nervous system uses electrical impulses to enable reactions
    1. cells called receptors detect stimuli (changes in the environment)
    2. Receptor cells have:
      1. nucleus
        1. cell membrane
          1. cytoplasm
          2. Impulses from receptors pass along sensory neurone to brain/spinal cord (CNS).
            1. Impulses are sent along motor neurons from brain (CNS) to effector organs.
            2. receptor
              1. sensory neuron
                1. CNS (co-ordinator)
                  1. motor neuron
                    1. effector
              2. Reflex actions
                1. sensory neurons - 5 senses
                  1. motor neurons - messages to muscles
                    1. relay neurons - connect sensory and motor - located in CNS
                      1. reflex arc electrical impulses bypass the conscious area of brain.
                        1. time between stimulus and response is as short as possible
                          1. only motor, relay + sensory neurons involved.
                        2. stimulus
                          1. receptor
                            1. co-ordinator
                              1. effector
                                1. response
                        3. Synapses
                          1. gap between 2 neurones.
                            1. nerve impulses diffuse neurotransmitters out of the synaptic knob + bind with post-neuron.
                              1. nervous system reacts slower than endocrime system.
                              2. Menstrual Cycle
                                1. mature egg released from ovary every 28 days
                                  1. FSH (follicle stimulating hormone)
                                    1. causes egg to mature, stimulates ovary to produce oestrogen
                                    2. oestrogen
                                      1. causes lining of womb to develop, inhibits FSH production, stimulates release of a mature egg.
                                    3. Artificial Control of Fertility
                                      1. oral contraceptives
                                        1. stop FSH production therefore no eggs mature.
                                        2. FSH used as drug to stimulate egg maturity.
                                          1. FSH+LH used in IVF to stimulate eggs to mature.
                                            1. LH is Luteinising hormone
                                              1. produced in pituitary gland, stimulates release of egg.
                                          2. Controlling conditions
                                            1. water levels and ions, blood sugar + temp.
                                              1. water - urine in kidney
                                                1. blood sugar - pancreas monitors by hormones
                                                  1. temp. - 37oC enzymes work best
                                            2. Homestasis
                                              1. sweating causes body to cool, energy from body used to evaporate the water in sweat.
                                              2. Plant growth control
                                                1. PHOTOTROPISM= sensitivity to light
                                                  1. GRAVITROPISM= respose to gravity
                                                    1. moisture=responses co-ordinated by plant hormone auxin
                                                      1. responses of roots/shoots to stimuli due to unequal distribution of plant hormones.
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