题解1.在重吸收钠量中,约65%在近曲小管重吸收,通常吸收量颇恒定,并不因进食钠多少而有所差异。维持钠的内环境恒定,主要依靠远曲小管和集合管的精细调节。在髓袢升支细段,钠、氯均易于通透;由于管内外浓度差,钠和氯均大量向管外弥散,在髓袢升支粗段,氯主动地重吸收,产生小管液正电 Explanation 1. In the reabsorption of sodium, about 65% in the proximal tubule reabsorption, usually a fairly constant amount of absorption, not due to the number of sodium intake vary. To maintain a constant sodium internal environment, mainly rely on distal convoluted tubule and the fine adjustment. In the medullary 袢 ascending branch of fine, sodium, chlorine are easy to penetrate; due to the concentration difference between the inside and outside, sodium and chlorine were widely dispersed outside the tube, in the medullary ascending branch thick section, chlorine initiative to reabsorb small tube fluid Electricity