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.
Many soft contact lenses have been marked by their manufacturers with a brand of the numbers â1,â â2,â and â3.â To help you determine if your pair is inside out, place the lens on your fingertip and hold it up to a bright light.