Capillary Walls Serve as Effective Permeability Barriers for ________

Question

Capillary walls serve as effective permeability barriers for ________.
A) oxygen and carbon dioxide
B) electrolytes
C) glucose
D) proteins
E) small water-soluble molecules

Accepted Answer

Capillary walls are permeable to small molecules like oxygen, carbon dioxide, glucose, and electrolytes, allowing these substances to pass through easily. However, they serve as effective barriers to larger molecules such as proteins, preventing them from passing through the capillary wall.