How many ventricles of heart does a man have? 每个人有几个心室？
The ventricles make up the greater part of the heart. 两个心室占心脏的大部分。
Brain ventricles are hollow chambers filled with fluid that supports brain tissue, and a layer of ependymal cells lines these ventricles. 脑室是中空结构，充满脑脊液以支持脑组织，且脑室周围排列着一层室管膜细胞。
Ependymal cells line the fluid-filled ventricles, so a drug to activate the cells could theoretically travel through this fluid directly to the stem cells. 室管膜细胞排列在充满脑脊液的脑室周围，所以理论上认为药物可以通过这些流动的脑脊液直接到达干细胞部位来活化这些细胞。
