Dr Jel Coward, a GP in Tywyn, north Wales, and an expert on wilderness medicine, said people suffering from extreme hypothermia often gave the impression of being dead, particularly as it can be difficult to detect breathing or a pulse.
If the nodules grow too large, breathing becomes difficult and death may result.
Much of the fighting in the operation is at elevations above 11, 000 feet, where thin air makes breathing more difficult.
According to the American Lung Association, 41 percent of Americans live in areas where air pollution can make breathing not just more difficult but dangerous.
FORBES: How Clean is the Air? Your iPhone Now Has the Answer
The idea, as he explained again at a news conference this morning, is to secure the Iraqi capital in order to give the government the breathing room it needs to make difficult political decisions that might give Iraqi insurgents reasons to support the government instead of fighting it.
The Sanctuary Guardian is a lightning-breathing flying lion beast that proves quite difficult until you learn its moves.
FORBES: 'Dark Souls Artorias Of The Abyss' Review: Like A Black Knight Out Of Hell
Information Minister Ernesto Villegas said that as the Venezuelan leader was breathing through a tracheal tube, it was difficult for him to speak.
Along with images of the puffy-faced Chavez came a government explanation for why no one has heard from the longtime president since his surgery: He's breathing through a tracheal tube that makes speech difficult.
Ms Sanford called efforts to be made to bridge the gap between a difficult family, before the family situation breaks down, by offering "breathing space" through a respite programme.
应用推荐