2.84 understand that stimulation of receptors in the sense organs sends electrical impulses along nerves into and out of the central nervous system, resulting in rapid responses

Notes


Receptor organs (i.e. eyes) contain many neurones. These neurones, when acted upon by a stimuli, send electrical impulses across synapses and to other neurones which conduct this electrical information. This chain of neurones are known as nerves.

Once a receptor is stimulated, this electrical impulse is conducted down the spinal nerves to the spine. This is where it enters the CNS, from here, the electrical signal is interpreted by the brain, which sends another impulse to the effector organs, causing a response.

This all happens very rapidly due to the fast speed at which electrical energy can be transferred, which is the reason for our 'rapid responses'.