A specialized cell that makes up the nervous system that receives and sends messages within that system is called a ________.

A) glial cell
B) neuron
C) cell body
D) myelin sheath

Neurons are the specialized cells that make up the nervous system and are responsible for receiving and sending messages within that system. Glial cells are also important for supporting and protecting neurons, but they do not have the same role in messaging. The cell body is the main part of the neuron that contains the nucleus and other essential cellular components. The myelin sheath is a protective layer that covers certain neurons and helps to speed up the transmission of messages, but it is not a specialized cell itself.