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Biology 1a Revision
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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
4. What causes infectious diseases and how can
our bodies defend themselves against them?

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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

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Going into a Sitting on
dark room a pin



Sensory neurone
Relay neurone

Motor neurone



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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…

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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…

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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.

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Pituitary gland

Fallopian tube




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