Explore epithelial specializations, focusing on membrane junctions and cellular transport in this 21-minute tutorial. Delve into critical examples from the intestine and respiratory system, including the CFTR gene and cystic fibrosis. Learn about epithelial cell properties, membrane movement control, apical surface modifications, and various junction types. Examine transcellular transport mechanisms, including molecule and fluid membrane passage. Gain insights into the CFTR's role in fluid export within the respiratory system. Benefit from a comprehensive review of junctions and their functions in epithelial tissues.