Receptor ---> Sensory neuron ---> CNS ----> Motor neuron ----> effector
the '------>' is the impulse (electrical charge)
Sensory receptors e.g. eyes, ears etc detect a stimulus (change)
Then the impulse passes along the neurons - the cells carrying the impulse to the CNS are the sensory neurons.
It travels along the neurons till it gets to the CNS
The brain in the CNS then sends an impulse out to the rest of the body through the help of the motor neuron.
The motor neurone then carries the impulses to the effector organs
And that is how you respond.
Effector organs are muscles or glands
Muscles respond to the arrival of impulses by CONTRACTING
Glands respond by SECRETING…