Nerves + Hormones

Reflex action
1. this is innate and instant
2. happens as a result of something
3. it protects you
  1. by helping you to survive
4. for example a bright light will cause your pupils to shrink
5. reflex arc
  1. stimulus
    1. light
    2. temprature
    3. change in position
    4. sound
    5. pressure
    6. chemical
    7. touch
    8. pain
  2. receptor cell
    1. receptor cells detect a stimulus
    2. hearing, sight, sound, taste and touch
  3. sensory neurone
    1. carries the impulse to the cnn
  4. relay neurone in the cns
    1. a group of nerve cells that coordinate fast innate actions
  5. synapse
    1. a gap between neurones
  6. synapse
    1. a gap between neurones
  7. motor neurone
    1. carries the impulse from the cns
  8. effector
    1. muscles
  9. response
    1. parts of your body that react to the change in the environment
hormonal control
1. cooling your body down
  1. if you get too hot your enzymes lose their structure
    1. therfore your enzyme cant catalyse the reactions in your body
  2. when your body temperature rises
    1. blood vessels dilate therefore more blood can flow
    2. you lose more heat when your skin flushes
    3. you will sweat more causing water to evaporate and cooling your skin
    4. body hairs stick up
2. reducing heat loss
  1. when you get too cold your enzyme reactions slow down
    1. then your cells will begin to die because of lack of energy
  2. when your body temperature decrease
    1. blood vessels constrict therefore less blood can flow
    2. you shiver and your muscles start to contract and relax rapidly
    3. sweat production is reduced
    4. body hair lies flat
the menstural cycle
1. controlling fertility
  1. pituitary gland
    1. FSH
      1. makes eggs mature in the ovaries
      2. stimulates the production of oestrogen
    2. LH
      1. It stimulates the release of a mature egg on day 14
  2. ovaries
    1. Oestrogen
      1. stimulates the build up of the uterus lining
      2. stimulates the pituitary gland to produce LH
      3. stops the production of FSH
    2. a mature egg is released from the ovaries every 28 days.
2. the pituitary gland secretes FSH which causes an egg to mature
  1. FSH causes the ovary to secrete oestrogen
    1. Oestrogen causes the pituitary gland to secrete LH which causes the egg to be released from the ovary
      1. the pituitary gland secretes FSH which causes an egg to mature
3. contraceptive pill
  1. oral contraceptive pill contain oestrogen and progesterone to inhibit egg maturation
  2. the first birth control pills...
    1. they had large amounts of oestrogen
    2. they had significant side effects
  3. birth control pill now...
    1. they now have a much lower dose of oestrogen
    2. they only have progesterone only
      1. they a re less reliable
      2. less side effects
4. IVF
  1. for people how cant or stuggle to get pregnant
  2. stages of ivf
    1. woman receives hormone injections
      1. several eggs mature in the ovary
        egg removed from ovarys
        eggs added to sperm in vitro
        incubation
        fetilisation
        embryo implanted into uterus
        pregnacy
central nervous system
1. it controls everything you do
2. it is made up of your brain and spinal cord
3. the brain
  1. there are 100,000,000,000 cells in your brain
  2. cerebrum
    1. controls the ability to speak and move around
  3. cerebellum
    1. controls coordination and balance
  4. thalamus
    1. this sends the electrical messages to your organs
  5. brain stem
    1. this controls your digestion
4. the spinal cord
  1. it sends signals to parts of your body
  2. they are electrical messages
homeostatics
1. its the control and steady maintenance of your internal conditions
  1. ion/salt content
    1. it is controlled by....
      1. sweating
      2. urinating
  2. blood sugar levels
    1. it is controlled by...
      1. stored in muscles and liver
      2. breakdown via digestion or respiration
    2. needs to be controlled so the cells can have a constant supply of energy
    3. glucose (sugar) is converted to glycogen by glucagon (stored sugar) which can be converted back to glucose by insulin
  3. temperature
    1. it is controlled by...
      1. shivering
      2. urinating
    2. to maintain the temperature at which enzyme works best at
  4. water content
    1. it is controlled by....
      1. breathing out
      2. sweating
      3. urinating
plant hormones
1. tropism is a plants responce
  1. negative tropism is when it moves away from the stimulus
  2. positive tropism is when the plant moves towards the stimulus
  3. geotrophic is a plants response to the earths gravitational field
  4. phototrophic is a plants response to light
2. auxin
  1. causes the response in a plant
  2. auxin moves away from the light and then cells multiply
  3. causes shoot to bend

Next up

Nerves + Hormones

Description

Resource summary

Similar

	Created by Jessica Dawkins about 9 years ago