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.
Systole is the phase during which the heart contracts resulting in  the movement of blood to the peripheral parts of the body. The  contractile force causes increase in the â¦ pressure of the arteries,  greater than the diastole which makes it possible for the blood to  reach the body.