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.
Best Answer: AV= Atrium to Ventricle SL= Ventricle to arteries (either aorta or pulmonary artery) The AV valves function to stop blood from flowing from the ventricle back to the atrium when the heart goes through it's first heart sound.