PATHOLOGY

Detailed explanation-1: -The walls of the alveoli share a membrane with the capillaries. That’s how close they are. This lets oxygen and carbon dioxide diffuse, or move freely, between the respiratory system and the bloodstream. Oxygen molecules attach to red blood cells, which travel back to the heart.

Detailed explanation-2: -External respiration is the process of gaseous exchange between air and the blood in the alveoli of the lungs. During this process, the oxygen from the alveolar air diffuses into the blood.

Detailed explanation-3: -The exchange of oxygen and carbon dioxide between the alveoli and blood in the lung is called: external respiration.

Detailed explanation-4: -Most bronchioles and large airways are part of the conducting zone of the lung, which delivers gas to sites of gas exchange in alveoli. Gas exchange occurs in the lungs between alveolar air and the blood of the pulmonary capillaries.