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.

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.

Fill in the Blank QuestionFill in the blank question.The rise and fall of blood in the heart chambers is the cause of the opening and closing of heart valves.

In isovolumetric ventricular contraction, both AV valves and semilunar valves are closed. Question 10Answera.Trueb.False

Which valves must be open for the ventricles to eject blood?Multiple choice question.Semilunar valvesAV valves

When the ventricles are contracting you would expect:Question 2Select one or more:a.Blood to be moving through the aorta and pulmonary trunk.b.The semilunar valves to be closed.c.Pressure in the ventricles to be lower than the pressure in the aorta and pulmonary trunk.d.The atria to be in diastole.e.The atrioventricular valves to be open.