In general, there are three stages leading from iron deficiency to anemia: 1  First, there is an insufficient supply of iron, which causes iron stores in the bone marrow to be depleted. This stage generally has no symptoms. 2  Second, iron deficiencies develop and begin to affect hemoglobin production.
Surfactant immune function is primarily attributed to two proteins: SP-A and SP-D. These proteins can bind to sugars on the surface of pathogens and thereby opsonize them for uptake by phagocytes. It also regulates inflammatory responses and interacts with the adaptive immune response.
Surfactant reduces surface tension, so that the alveoli in the lungs are able to expand. It is essentially a biological detergent.Surfactant reduces surface tension. Without surfactant, the wet surfaces of the alveoli in your lungs would stick together and your lungs would not be able to expand-so, you would not be able to breath.The alveoli are the tiny sacs in your lungs where oxygen is captured from inhaled air and absorbed into your bloodstream.ithout surfactant, the wet surfaces of the alveoli in your lungs would stick together and your lungs would not be able to expand-so, you would not be able to breath. The alveoli are the tiny sacs in your lungs where oxygen is captured from inhaled air and absorbed into your bloodstream.