Explain the mechanism of pulmonary respiration in human beings
Answers
Explanation:
While pulmonary ventilation is the process by which oxygen enters and carbon dioxide exits the alveoli, respiration is the process by which oxygen and carbon dioxide diffuse in and out of the blood. Respiration is also referred to as gas exchange, and it occurs in two areas of the body. External respiration refers to gas exchange across the respiratory membrane in the lungs. Internal respiration refers to gas exchange across the respiratory membrane in the metabolizing tissues, like your skeletal muscles, for example. In the following discussion of gas exchange, imagine yourself as an oxygen molecule going to work. You enter the body via the lungs, travel through the body by the bloodstream, and ultimately enter a cell to go to work. You're a hard worker, and as such, you get dirty and become carbon dioxide. To go home from work, you leave the cell and travel to the lungs via the bloodstream, the same way you got to work.