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biology 0610printed 178 · PDF 178
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printed 178 · PDF 178
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Notes
Human Nervous System
● Changes in an organism's environment are called stimuli.
● These are sensed by specialised cells called receptors.
● The organism responds to this using effectors.
● The way in which receptors sense stimuli and then send signals to effectors is
called coordination.
● There are two ways of sending signals, one is through nerves and second is
through hormones.
Neurones
● The human nervous system is made up of specialised cells called neurons.
● Neurons are adapted to carry out their function.