2.84 Responses

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.

Impulses from our sensory organs are passed from the receptor to the coordinator (CNS) by sensory nerves. The impulse is then passed up the spinal cord to the brain where the brain generates a response and sends impulses back down the spinal cord through motor nerves which create the response.

For example if the eyes saw a red pen the co-ordinator (the brain) could decide “I like red; pick up the pen” this signal will be sent back down the spine through a motor nerve in the arm where the effectors (arm muscles) pick up the pen. It is important to note that all of this takes place reasonably fast but can be sped up by removing the interaction of the brain…[see 2.85]