During the ventricular ejection period of the cardiac cycle, 1) the tricuspid valve is open 2) the bicuspid valve is open 3) both semilunar valves are closed 4) both semilunar valves are open

To analyze the conditions during the ventricular ejection period of the cardiac cycle, let's break down the phases of the cardiac cycle and the status of the heart valves: 1. **Ventricular Ejection Period**: This phase occurs when the ventricles contract and pump blood into the arteries. It typically follows the isovolumetric contraction phase. 2. **Valves Status**: - **Tricuspid Valve**: This valve is located between the right atrium and right ventricle. During ventricular ejection, the right ventricle contracts, causing the tricuspid valve to be closed to prevent backflow into the atrium. - **Bicuspid (Mitral) Valve**: This valve is located between the left atrium and left ventricle. Similar to the tricuspid valve, during ventricular ejection, the left ventricle contracts, causing the bicuspid valve to be closed. - **Semilunar Valves**: These include the aortic valve (leading to the aorta) and the pulmonary valve (leading to the pulmonary artery). During the ventricular ejection phase, both of these valves are open to allow blood to flow from the ventricles into the arteries. Based on this analysis, the correct statement regarding the status of the valves during the ventricular ejection period is: 4) **Both semilunar valves are open.** The other statements are incorrect because both the tricuspid and bicuspid valves are closed during this phase.