[名词解释] 永久性细胞(permanent cell)

瘢痕组织(scar tissue) 下列哪项不是胸痹的病因 ["寒邪内侵","先天遗传","饮食不当","情志失调","年老体虚"] 造血干细胞(hematopietic stem cell) 胸痹病位在心，尚与何脏腑功能失调有关 ["肝胆脾","肺脾肾","脾肾","肝脾肾","肝脾"] 干细胞(stem) 永久性细胞(permanent cell)