Describe the difference between the function of a receptor and the function of an effector. Give examples.

When seeing this sort of question, I would handle it by explaining what both a receptor and an effector is firstly and giving examples. Secondly, I would explicitly state the difference to make sure the answer is really clear.

I am going to start off with a 'mark scheme' for this question and then explain fully: receptor detects change in stimulus eg eye. Effector causes reaction to stimulus eg muscle. Therefore, receptor detects change and effectors respond to them. HERE IS A BETTER EXPLANATION.

Firstly, with receptors, they detect change's from the surrounding enviroment. Therefore, receptors detected stimulus. (stimulus is just a fancy word for change in environment that examiners like!) An example of change they detect could be a change in the light of the enviroment (eg turning a light on). Therefore, the receptor in this situation is an eye.

Secondly, with effectors, they cause a reaction to the stimulus (ie they are responding to the change). For example, muscles in the arm, bringing arm up to shield eyes. Then to conclude, to make sure the examiner understands you have completely grasped the concept: say: receptors detects change and effectors causes responce to the change.