GENERAL HISTOLOGY

Detailed explanation-1: -Respiration: The lungs are the primary organs of respiration, where the exchange of gases takes place. In the alveoli, which are the functional units of lungs, the oxygen is taken up, and carbon dioxide is removed from the bloodstream through the alveolar-capillary bed [12].

Detailed explanation-2: -The organ that is made up of masses of alveoli is the lungs. Although the lungs do expand and shrink, they are not actually made of muscle. The lungs are spongy sacs of air, composed of millions of tiny spheres called alveoli. The alveoli are the functional units of the lungs and facilitate gas exchange.

Detailed explanation-3: -When you breathe in, air enters your airways and travels down into the air sacs, or alveoli, in your lungs. This is where gas exchange takes place. The circulatory system, which is made up of the heart and blood vessels, supports the respiratory system by bringing blood to and from the lungs.

Detailed explanation-4: -Each alveolus consists of three types of cell populations: Type 1 pneumocytes. Type 2 pneumocytes. Alveolar macrophages.

Detailed explanation-5: -Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them.