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.

What changes in pressure lead to the opening and closing of heart valves?

The opening and closing of the heart valves is associated with ______.Multiple choice question.changes in blood oxygenationchanges in blood compositionchanges in chamber pressurestretch of tissue fibers in the pericardium

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.

Fill in the Blank QuestionFill in the blank question.The AV valves guard the opening between the and , which are chambers of the heart.

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.