1. it serves as the functional unit of the nervous system.
2. it collects information from the sense organ such as the eyes and the nose.
3. it serves as the primary organ of the central nervous system.
4. it controls or regulates body's internal brain environment, including the body temperature, pulse and respiration rate, and blood pressure.
5. it serve as a pathway of messages to and from the brain.


a. spinal cord
b. neurons
c. peripheral nervous system
d. nervous system
e. autonomic nervous system
f. brain