Which of the following parts of a neuron is covered by a fatty sheath?

The highly specialized cells called neurons can:

Which one of the following pairs of structures distinguishes a nerve cell from other types of cell?

The most appropriate definition of Neuroglial cells is that they are:

Which of the following statements are correct for a nerve cell?
$(I)$. Each neuron has a cell body
$(II)$. Each neuron has a single axon
$(III)$. Neurons are the functional units of the nervous system
Select the correct option.

Which of the following pairs of structures is distinct from the other types of cells found in neurons?