The definition of a possum, or opossum, is a tree-dwelling nocturnal marsupial with fur and a prehensile tail. A small Australian mammal that lives in a tree and only comes out at night is an example of a possum. possum. possum.
More than two thirds of patients who die of anaphylaxis do so within the first: half hour. ____, a harsh, high-pitched inspiratory sound, occurs when swelling in the upper airway closes off the airway; the swelling can eventually lead to total obstruction. Stridor.
The body's response to anaphylaxis is to release adrenaline, a natural antidote to some of the chemicals released as part of a severe allergic reaction. Injected adrenaline works rapidly to reduce throat swelling, open up the airways, and maintain blood pressure.