Question

During the cardiac cycle, which of the following conditions never occurs?

Group of answer choices

SL valves are open while the AV valves are closed

All the valves are closed

AV valves are open while the SL valves are closed

All the valves are open

Answer 1

Answer: All the valves are open

Comments: The cardiac cycle is the period between the endings of one heartbeat to the generation of another. In the period of cardiac cycle all valves never be open in any case. However, the other condition may occur like the closing of the entire valve: In isovolumetric condition, all valves are closed and the ventricle generates the positive pressure without any change in the volume to overcome the resistance of the semiluner valve. Opening of AV valves while the closed SL valve: This is the condition when the blood forced into the ventricles. SL valves are open while the AV valves are closed: When the ventricle contract, ventricular pressure increases and blood pumped into the major arteries in this condition this type of situation comes.