BI-1115
The heart
Biology · Secondary 3 · Hard · The heart
During one cardiac cycle, the right ventricle contracts and forces blood into the pulmonary artery. Which statement correctly describes the role of the valves during this contraction?
- The tricuspid valve closes and the semilunar valve in the pulmonary artery opens.
- The tricuspid valve opens and the semilunar valve in the pulmonary artery closes.
- Both the tricuspid and semilunar valves open at the same time.
- Both the tricuspid and semilunar valves close at the same time.
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