How does caffeine get into the brain hint look at the chemical structure of caffeine?

When caffeine enters the body it is metabolized by the liver and broken down into theophylline, theobromine, and paraxanthine which are absorebed by the blood. These metabolites are absorbed into the membranes and pass easily through the blood-brain barrier through both diffusion and saturation.

Ithink a saturated phospholipid