The key to comprehending what protects the brain from microorganisms, differential drug inter- actions, and the challenge of breaching this barrier to deliver agents to fight brain disease are a few of the questions and problems connected with the bbb.
Capillaries surround and saturate the brain.
Only a few substances can pass through the bbb. Glucose, salt, water, and certain nutrients can pass through or be actively transported into the brain. Lipid-soluble substances that are smaller in size are good candidates for passage. The bbb is more for keeping things out than imprisoning substances within. Exploring the bbb will vary depending on the mode selected.