Discussion
As the right ventricle contracts, the........................ valve closes, preventing blood from back flowing to the atrium.
Answer: B
The valve is the tricuspid valve.
The tricuspid valve lies between the right atrium and the right ventricle. When the right ventricle contracts, the rising pressure closes it, so blood cannot flow back into the atrium and is driven instead through the pulmonary valve into the pulmonary artery.
The bicuspid (mitral) valve does the same job on the left side, between the left atrium and left ventricle. The pulmonary valve opens, not closes, when the right ventricle contracts, and the vena cava is a vein, not a valve.
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