Pulmonary alveolus thin fluid coating within all alveoli. The fluid coating is produced by the body in order to facilitate the transfer of gases between blood and alveolar air. The surfactant is produced by the type II cells which are the most numerous cells in the alveoli, yet do not cover as much surface area as the squamous alveolar cells (a squamous epithelium). Type II cells also repair the endothelium of the alveolus when it becomes damaged. Insufficient surfactant in the alveoli can contribute to atelectasis (collapse of part or all of the lung). Without pulmonary surfactant, atelectasis is a certainty; however,
History of beliefs about the human body and its disorders and therefore the male body is often explained in place of the female body. A major intervention in the history of the body in the West was Thomas W. Laqueur's 1990 book "Making Sex: Body and Gender from the Greeks to Freud". Laqueur argued that from the eighteenth century into the late twentieth, Western societies had generally thought of humans as having two fundamentally sexes, male and female. But Laqueur argued that from ancient times, the prevailing intellectual understanding of sex was that women were anatomically simply an inferior form of men. For example, Renaldus Columbus, writing