NEET PG DENTAL EXAM

Detailed explanation-1: -Tracheoles have thin and moist walls to increase the efficiency of gaseous exchange. The large number of tracheoles also provides a large surface area to facilitate gaseous exchange through diffusion directly into the cells. Some insects such as grasshoppers have air sacs in their trachea system.

Detailed explanation-2: -Tracheole walls are capable of transporting oxygen at high rates by diffusion because they are thin (usually <0.1 m) and have a very large surface area to volume ratio. Thus, the tracheoles are likely the major site of gas exchange between the tissues and the tracheal system.

Detailed explanation-3: -A respiratory surface is covered with thin, moist epithelial cells that allow oxygen and carbon dioxide to exchange. Those gases can only cross cell membranes when they are dissolved in water or an aqueous solution, thus respiratory surfaces must be moist.