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Pulmonary surfactant is a surface-active lipoprotein complex (phospholipoprotein) formed by type II alveolar cells. The proteins and lipids that make up the surfactant have both hydrophilic and hydrophobic regions.
Cholesterol is manufactured by the liver in response to the bodyâs need for two things: bandaids and hormones. Cholesterol is natureâs bandaid, providing the necessary materials to shore up damaged tissues and support cells. Cholesterol is also at the center of every steroid hormone: estrogen, progesterone, testosterone, cortisol, DHEA, aldosterone.