The blood-brain barrier serves five key functions: to protect neurons and glia from bacterial toxins and infectious agents, initiate electrical impulses, maintain stable composition and balance of ions in the interstitial fluid, help nerves communicate, and maintain tight control over substances moving from blood into the central nervous system tissue.

1. The BBB or blood-brain barrier serves several functions which include:
Protect neurons and Glia from bacterial toxins and infectious agents
Initiate electrical impulses
Maintain stable composition and balance of ions in the interstitial fluid
Helps nerves to communicate
Maintain tight control over substances moving from blood into the CNS tissue
A. Protect neurons and Glia from bacterial toxins and infectious agents
B. Initiate electrical impulses
C. Maintain stable composition and balance of ions in the interstitial fluid
D. Helps nerves to communicate
E. Maintain tight control over substances moving from blood into the CNS tissue