Answer the following question given this paragraph: 

Although the nervous system is very complex, nervous tissue consists of just two basic types of nerve cells: neurons and glial cells. Neurons are the structural and functional units of the nervous system. They transmit electrical signals, called nerve impulses. Glial cells provide support for neurons. For example, they provide neurons with nutrients and other materials.


Q: Nervous tissue consists of just two basic types of nerve cells: neurons and?

 Choices:

- white blood cells

- red blood cells

- mammalian cells

- glial cells

A:
glial cells
