When the first heart sound is heard, what is occuring with the heart valves?Multiple ChoiceThe semilunar valves are closing.The AV valves are opening.The semilunar valves are opening.The AV valves are closing.

What heart sound occurs with closure of AV valves?Group of answer choicesS1 (first heart sound)S2 (second heart sound)S3 (third heart sound)S4 (fourth heart sound)

Which of the following indicates the first and second heart sound in the correct order a. Atrioventricular valve closure — semilunar valve closure b. Ventricular diastole — atrioventricular valve closure c. Atrial systole — ventricular systole d. Ventricular systole — semilunar valve closure

Which statement is correct with regarding to the cardiac cycle ?The pause between the end of the second heart sound and the beginning of the first heart sound coincides with ventricular diastoleDuring ventricular systole, atrioventricular valves open and semilunar valves closeFrom the atria nearly 70% of the blood flows into the ventricles during atrial systoleThe first heart sound is of shorter duration and created by the closure of the semilunar valves.

Heart sounds are generated when blood vibrates the wall of the heart due to the ______ of the valves.Multiple choice question.stretchingopeningclosing

What causes the semilunar valves to open during the cardiac cycle?Multiple ChoiceAtrial pressure is greater than ventricular pressure.Ventricular pressure is greater than arterial pressure.Arterial pressure is greater than ventricular pressure.