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【单选题】
有关右心室和肺动脉之间的关系，下列描述哪一项是错误的
A.
右心室借右室流出道与肺动脉相连
B.
肺动脉瓣由3个半月形的瓣叶组成
C.
肺动脉3个瓣叶分大、中、小三叶
D.
肺动脉3个瓣叶袋口朝上，每个瓣叶游离缘中央有一半月小结
E.
右心室流出道为一光滑的肌性管状结构
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B.
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