Missouri University of Science and Technology tuition is $7,734 per year for in-state residents. This is 13% more expensive than the national average public four year tuition of $6,841. The cost is 53% cheaper than the average Missouri tuition of $16,299 for 4 year colleges.
Systole: Period of ejection. AV valves closed Semilunar valves opened AV valves closed Semilunar valves closed Diastole: Period of isovolumic relaxation. Blood flowing back toward the relaxed ventricles causes the semilunar valves to close, which is the beginning of ventricular diastole.
When the heart beats, the atria (atrial systole) and ventricles (ventricular systole) contract and the open bicuspid and tricuspid valves are pushed closed due to blood pressure in the chambers. The relaxed chordae tendineae tense up to hold the cusps of the atrioventricular valves in place when they close. This prevents prolapsing of the valve leaflets and blood from regurgitating (flowing backwards) into the upper atrial chambers (the left atrium and right atrium).