Atelectasis is composed of 78% nitrogen and 21% oxygen. Since oxygen is exchanged at the alveoli-capillary membrane, nitrogen is a major component for the alveoli's state of inflation. If a large volume of nitrogen in the lungs is replaced with oxygen, the oxygen may subsequently be absorbed into the blood, reducing the volume of the alveoli, resulting in a form of alveolar collapse known as absorption atelectasis. It is usually associated with accumulation of blood, fluid, or air within the pleural cavity, which mechanically collapses the lung. This is a frequent occurrence with pleural effusion, caused by congestive heart failure (CHF).
Body-to-body communication Culture can influence nonverbal communication in many ways. The same gestures in different countries can have distinct meaning. For example, the American A-OK sign can have an obscene meaning in many nations in Europe, having sexual implications. Facial expression is another mean of nonverbal communication that culture affects. Humans have the ability to express emotions through facial expressions. "Cultural display rules" are learned during childhood and plays a big part on how people from different cultures manage and modify their emotional expressions depending on the social situation that they are in. In an experiment done my Ekman and Friesen; results