Understanding the Blood Brain Barrier

What is the primary function of the blood brain barrier?

• To facilitate the rapid exchange of gases

• To block all substances from entering the brain

• To selectively allow beneficial substances into the brain while keeping harmful ones out

• To allow all substances to enter the brain

Which type of cell is primarily associated with the blood brain barrier?

• Red blood cells

• Neurons

• Muscle cells

• Glial cells

What role do pericytes play in the blood brain barrier?

• They transmit nerve impulses

• They form the myelin sheath

• They regulate blood flow and support endothelial cells

• They produce cerebrospinal fluid

How do oxygen and carbon dioxide cross the blood brain barrier?

• Through transporter proteins

• By dissolving in lipids and diffusing across cell membranes

• Via active transport

• Through large pores in the capillaries

What is a common strategy to deliver drugs across the blood brain barrier?

• Using high doses of the drug

• Blocking the blood brain barrier completely

• Using transporter proteins to facilitate drug entry

• Increasing the size of the drug molecules