Answer: 2 and 4
In general, the nervous system is made up of neurons and glia
Explanation:
Neurons helps in the transmission of impulses from the receptors in the body to the brain or spinal cord, and then back to the effectors (muscles and glands) for action.
On the other hand, glia are cells that form a network and give protection to the tissues of the nervous system.
Thus, neurons and glia are the two cells making up the nervous system
