Atelectasis Atelectasis Atelectasis is the collapse or closure of a lung resulting in reduced or absent gas exchange. It may affect part or all of a lung. It is usually unilateral. It is a condition where the alveoli are deflated down to little or no volume, as distinct from pulmonary consolidation, in which they are filled with liquid. It is often called a collapsed lung, although that term may also refer to pneumothorax. It is a very common finding in chest x-rays and other radiological studies, and may be caused by normal exhalation or by various medical conditions. Although frequently described
Body shape of the male and female body occurs for the purposes of reproduction. In adult humans, muscle mass may change due to exercise, and fat distribution may change due to hormone fluctuations. Inherited genes play a large part in the development of body shape. Due to the action of testosterone, males may develop these facial-bone features during puberty: Because females have around 1/4 the amount of testosterone of a male, these features do not develop to the same extent. Hence female faces are generally more similar to those of pre-pubertal children. Skeletal structure frames the overall shape of the body and