![]() What are the additional costs of increased ventilation? Physically dissolved in plasma and chemically bound to hemoglobinĢ. What are the two forms in which oxygen is transported? The partial pressure refers to the amount of that gas in a given space.ġ. In order for oxygen and carbon dioxide to diffuse across the alveolar-capillary membrane, there must be a difference in partial pressure between the two gases. The basement membrane is a thin layer of connective tissue that sits beneath the alveolar cells and serves to support them. Type II alveolar cells secrete surfactant as well, but they also have the ability to regenerate Type I cells.Ĭapillary endothelial cells line the capillaries and have small pores that allow gases to diffuse in and out of the bloodstream. These cells make up the walls of the alveoli and are responsible for secreting surfactant. Type I alveolar cells are the primary cell type involved in gas exchange. ![]() The alveolar cells are the primary cell type involved in gas exchange. The alveolar-capillary membrane is made up of several different types of cells, including:
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