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Biology 1a
1. How do human bodies respond to changes inside
them and to their environment?
2. What can we do to keep our bodies healthy?
3. How do we use/abuse medical and recreational
drugs?
4.…read more

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Put these words in order to describe the
sequence involved in a reflex action (you may
repeat words if necessary)
· Motor neurone, effector, synapse, central
nervous system, stimulus, sensory neurone,
receptor, relay neurone…read more

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Going into a Sitting on
dark room a pin
Stimulus
Receptor
Sensory neurone
Relay neurone
Motor neurone
Effector
Response…read more

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When a receptor detects a stimulus an
electrical impulse is generated and travels to
the brain or spinal cord (known as the
coordinator) along neurones
· The coordinator then sends an electrical
impulse to an effector (muscle or gland) which
make a change happen (response)
· Reflex actions are automatic, rapid and
protective…read more

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Page 8

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Complete the sentences using the words provided:
·An electrical ....................... passes from the
sensory receptor (e.g. nerve ending), along the
sensory ...................... to the spinal cord.
·The impulse then passes to a ......................
neurone and straight back along a motor neurone to
the .................... organ (e.g. muscle).
·The time between the stimulus and the reflex action is
as .............................. as possible. It allows you to
react to .................... without thinking about it.…read more

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Neurones never touch
each other ­ there is a
small gap between them
called a SYNAPSE. A
signal is sent from one
neurone to the next by
a chemical transmitter
across the synapse.
These transmitters are
then destroyed.…read more

Page 10

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Pituitary gland
Fallopian tube
Ovary
Uterus…read more

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