People faint when the normal blood supply to the brain is suddenly cut down. This can happen if they are surprised or shocked by sudden news or by something they see suddenly. Some people faint if they see others hurt .Some people faint in crowds. Others faint if they are in a room that is hot and stuffy. If a person faints while standing, lay him down. If his face is pale, lift his feet .If he is sitting down when he faints, place his head between his knees, loosen any tight clothing that might keep him from breathing easily .If possible, place a wet cloth on his forehead. In this passage, the writer explains  _  .
why people faint and how we help them when people faint and when we help them why people faint and where we help them how people faint and why we help them