PATHOLOGY

Detailed explanation-1: -Alveoli represent the most distal portion of the respiratory tract. There are approximately 500 million alveoli in the human body. [1] Each alveolus is separated from the other by an alveolar septum, which contains the pulmonary capillaries participating in gas exchange and connective tissue.

Detailed explanation-2: -The musculoskeletal system (also known as the locomotor system) is an organ system that gives animals (including humans) the ability to move, using the muscular and skeletal systems.

Detailed explanation-3: -Pulmonary alveolus ( plural: alveoli) are tiny air sacs that function as basic respiratory units. It is a hollow cup-shaped cavity in the lung parenchyma, where gas exchange takes place. Lung alveoli are found in the acini at the beginning of the respiratory zone.