From the list, indicate three types of molecules that are permeable to the blood-brain barrier. (Check all that apply.)
A) All drugs
B) Caffeine
C) Glucose
D) Large proteins
E) Oxygen

Question

Quizplus · Accepted Answer

The blood-brain barrier is selectively permeable, allowing certain substances to pass through while blocking others. Caffeine, glucose, and oxygen are among the molecules that can cross the blood-brain barrier. Caffeine and oxygen can diffuse through due to their small size and lipid solubility, while glucose is transported across via specific glucose transporter proteins. Large proteins and many drugs, however, cannot easily cross the barrier due to their size and lack of specific transport mechanisms.

From the List, Indicate Three Types of Molecules That Are