Question

how does a body response to a stimulus

Answer 1

All living organisms need to respond to changes in the environment. Although this happens in different ways the pattern of events is always the same:

stimulus > detection > co-ordination > response
 

Plants can also respond to stimuli but the response is usually slower than that of animals. 

Answer 2

Plants can also respond to stimuli but the response is usually slower than that of animals. Receptors are specialised cells that detect a stimulus. Their job is to convert the stimulus into electrical signals in nerve cells. ... position of the body - receptors in the ears.