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以下哪一项是心脏箭膜的功能()。
A.It heips exchange water and chemicals between the blood and thetissues,它有助于在血液和组织之间交换水和化学物质。
B.it forms a cosed circuit of hollow tubes that allow blood to be transported to and from the heart.它形成了空心管的封闭循环,可以将血液输送到心脏和从心脏输送。
C.It carries blood away from the heart.它将血液带离心脏。
D.It prevents backflow or spillage of blood back into the chambers.它可以防止血液回流或溢出到腔室。
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