Annual deaths from tornadoes, earthquakes and floods together total fewer than 200. The most deadly heat wave in recent years occurred in Chicago over a week in July 1995, when temperatures hovered around 100 degrees.
Cardiac Cycle: 1st Systole Phase. During the systole phase, the right ventricle receives impulses from the Purkinje fibers and contracts. The atrioventricular valves close and the semilunar valves open. The de-oxygenated blood is pumped into the pulmonary artery.
Constant, sharp pain and disrupted hearing typically accompany bullous myringitis. Commonly used by otolaryngologists and other doctors, the otoscope has a bright light and magnifying glass, allowing a look deep inside the ears. The tympanic membrane, or ear drum, forms a barrier between the middle and outer ear.