Question

55 place a single word into each sentence to make it correct. not all terms will be used. 1. when atrial pressure is greater than ventricular pressure, the semilunar valves open. 2. when ventricular pressure rises above atrial pressure, the blood in the ventricle pushes the av valves (click to select) 3. in the semilunar valves, when the pressure in the (click to select) is greater than the pressure in the ventricles, valves are forced open. 4. when ventricular pressure is lower than arterial pressure, (click to select) blood holds the semilunar v

Explanation:

1. When atrial pressure is greater than ventricular pressure, the atrioventricular (AV) valves open, not semilunar valves. Semilunar valves open when ventricular pressure exceeds arterial pressure.
2. When ventricular pressure rises above atrial pressure, the blood in the ventricle pushes the AV valves closed to prevent back - flow into the atria.
3. In the semilunar valves, when the pressure in the ventricles is greater than the pressure in the arteries, the semilunar valves are forced open.
4. When ventricular pressure is lower than arterial pressure, arterial blood holds the semilunar valves closed to prevent back - flow into the ventricles.

Answer:

1. atrioventricular
2. closed
3. ventricles
4. arterial