6.關於調節腎絲球入球小動脈管徑的內在機制(intrinsic regulatory mechanism)，下列敘述何者正確？ (A)交感神經(sympathetic nerve)支配 (B)副交感神經(parasympathetic nerve)支配 (C)感壓反射神經(baroreceptor reflex nerve)支配 (D)腎絲球小管回饋(tubuloglomerular feedback)