Drug X Passes Through the Blood-Brain Barrier Via Active Transport

Multiple Choice

Drug X passes through the blood-brain barrier via active transport. What does this mean?

A) Drug X diffuses through the blood-brain barrier.
B) Drug X uses osmosis to pass through the blood-brain barrier.
C) Drug X directly attaches to neurons to pass through the blood-brain barrier.
D) Drug X uses channels to pass through the blood-brain barrier.