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RESPONDING TO CHANGE
Describe how a nervous response is
brought about by stimuli, including the
roles of receptors, sensory neurones, the
coordinator and motor neurones.
· Stimulus (Light bulb) -> Receptor (Eye) -> impulse
travels along the sensory neurone to -> Coordinator
(Brain) -> impulse travels along the motor neurone to
-> Effecter (Eye muscle) -> Response
· Neurone = A single nerve…read more

Slide 3

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RESPONDING TO CHANGE
Describe a reflex action and the role of the
relay neurone in this action.
· Receptor (Finger) -> impulse travels along sensory
neurone -> comes to synapse -> goes onto the relay
neurone -> to synapse -> along the motor neurone ->
Effecter (Arm muscle)
· Synapse = gaps between the end of a neurone and
the start of another or an effecter.
· Axon = the end of a neurone.…read more

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RESPONDING TO CHANGE…read more

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RESPONDING TO CHANGE
Explain that four internal conditions
controlled by the body include; water
content, ion content, body temperature
and blood sugar. Describe, in very broad
outline, how they are controlled.
· Ion content leaves body 1) in sweat 2) excess lost via
kidneys in urine.
· The water content of body leaves body 1) in breath 2)
as sweat 3) excess is lost via kidneys in urine.
· Temperature -> maintain temperature at which
enzymes work best.
· Blood sugar levels -> to provide the cells with a
constant supply of energy.…read more

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RESPONDING TO CHANGE
Describe hormones as chemicals which
coordinate reactions in the body and that
are secreted by glands and reach their
target organs via the blood stream.
· Pituitary glands -> FSH and LH.
· Ovaries -> oestrogen and progesterone.
· FSH (Follicle stimulating hormone) ­ egg mature +
oestrogen to be released.
· Oestrogen ­ thickens uterus lining + inhibits FSH
· LH (Luteinizing hormone) ­ egg is released from
ovary + stimulates progesterone.…read more

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