Efferent (or ferrying away) which carry messages from the central nervous system to parts that shall carry out the response or the effectors (muscles). They are also called "motor" nerves

Association nerves, which link together the afferent and efferent nerves.
Which organ of your body was the detector and which the effector in Activity-1?
What do you think that the information carried on the afferent and efferent nerves?

Activity-1 showed a response on which you had some control or it was voluntary (recall the use of the voluntary and involuntary muscles that you studied in class 9th.). We know that our body would also need to respond to certain situations on which we may not have a control. Such responses are called reflexes.A simple activity shall help us to understand this better

Cross the legs, in a seated position, so that the lower half of the uppermost leg hangs freely over the other. Strike the area below the knee cap sharply, while firmly grasping the front part of the thigh with the other hand. Note the changes in shape of the thigh muscles.
Note that although we are fully conscious, we cannot prevent the thigh muscles from contracting. Such a response