Answer:
Forms of passage of substances across the blood–brain barrier. (A) Passive diffusion: fat-soluble substances dissolve in the cell membrane and cross the barrier (e.g., alcohol, nicotine and caffeine). Water-soluble substances such as penicillin have difficulty in getting through.
Just macroanatomy right?
I would say A, as the only answer.
Hope that helps,
Going to the movies, going to the gym, biking etc.
