Yawning redirects here. For the fish species, see Yawning (fish) . A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the eardrums, followed by an exhalation of breath.Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality. yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the eardrums, followed by an exhalation of breath. Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality.
A radiological emergency is an emergency in which there is, or is perceived to be, a hazard due to radiation exposure from a source. As sources of radiation are used in various fields, including industry, medicine and research, radiological emergencies may occur anywhere. These are examples of radiological emergency situations and associated conditions that a first responder may face: 1  Medical Symptoms of Radiation Exposure. 2  Loss or Theft of Dangerous Radioactive Source. 3  Public Radioactive Contamination/Exposure.
an unlooked for or sudden occurrence, often dangerous, such as an accident or an urgent or pressing need. 1  emergency department an area of a hospital especially equipped and staffed for emergency care. Popularly called emergency room. emergency medical technician (EMT) a provider of emergency care (health care at the basic life support level); this may include spinal immobilization, administration of oxygen, and control of bleeding. In some states there are modular training programs where an EMT can add skills to the basic level. emergency medical technician. n. Abbr. EMT