The nervous system is divided into two main systems, the central nervous system (CNS) and the peripheral nervous system. The spinal cord and the brain make up the CNS. Its main job is to get the information from the body and send out instructions. The peripheral nervous system is made up of all of the nerves and the wiring. This system sends the messages from the brain to the rest of the body.
Sensory impulses are the signals that starts from the receiving organs.e.g. when ur hand touches a hot cup or icecube or fur or silk,it is able to recognise that.. thus sensory impulse is TOWARDS the brain.. the motor impulse is just the opposite of that.. e.g. when u touch a very hot plate ur brain instantaneously instructs ur hand to withdraw from the hot plate. thus motor impulse is FROM the brain..
ANSWER b.)
A reflex arc refers to the neural pathway that a nerve impulse follows. The reflex arc typically consists of five components (3):
1. The receptor at the end of a sensory neuron reacts to a stimulus.
2. The sensory (afferent) neuron conducts nerve impulses along an afferent pathway towards the central nervous system (CNS).
3. The integration center consists of one or more synapses in the CNS.
4. A motor (efferent) neuron conducts a nerve impulse along an efferent pathway from the integration center to an effector.
5. An effector responds to the efferent impulses by contracting (if the effector is a muscle fiber) or secreting a product (if the effector is a gland).
HOPE IT HELPED.. ALL THE BEST..!!
Sugi.