Large mass of nerve tissue with about 100 billion neurons

A) internuncial neurons
B) membrane excitability
C) serotonin
D) interneurons
E) autonomic system
F) brain
G) ventricles
H) cerebrospinal fluid
I) arteriography
J) Glasgow Coma Scale (GCS)
K) electromyography (EMG)
L) lumbar puncture

Brain

The organ located in the head of an organism that coordinates its actions and sensory information by transmitting signals to and from different parts of its body.

Neurons

Specialized cells within the nervous system that transmit information through electrical and chemical signals.