NEET PG DENTAL EXAM

Detailed explanation-1: -The exchange of gases (oxygen and carbon dioxide) occurs between the alveoli and blood capillaries by simple diffusion. This naturally occurs according to the partial pressure gradients of the respective gases.

Detailed explanation-2: -The gases on either side of the gas exchange membrane equilibrate by simple diffusion. This ensures that the partial pressures of oxygen and carbon dioxide in the blood leaving the alveolar capillaries, and ultimately circulates throughout the body, are the same as those in the FRC.

Detailed explanation-3: -Diffusion is a process in which transport is driven by a concentration gradient. Gas molecules move from a region of high concentration to a region of low concentration. Blood that is low in oxygen concentration and high in carbon dioxide concentration undergoes gas exchange with air in the lungs.

Detailed explanation-4: -The actual exchange of gases occurs due to simple diffusion, which means that energy is not required to move oxygen or carbon dioxide across membranes. Instead, these gases follow pressure gradients that allow them to diffuse.