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.
1. A substance, such as detergent, that is added to a liquid to increase its ability to spread. 2. A substance produced by the tiny air-filled sacs of the lung that reduces the surface tension of the fluids coating the lung.Surfactant helps keep the tiny air sacs from collapsing during normal breathing. substance, such as detergent, that is added to a liquid to increase its ability to spread. 2. A substance produced by the tiny air-filled sacs of the lung that reduces the surface tension of the fluids coating the lung. Surfactant helps keep the tiny air sacs from collapsing during normal breathing.