THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Distal Convoluted Tubule and Connecting Tubule The structure reflects the active transport function of these segments with luminal and basolateral surface area amplification and ample endowment of organelles (Figure 3.11). Between the DCT and the collecting duct is the connecting tubule (CNT) (Figure 3.8).

Detailed explanation-2: -Potassium ions can be transferred in and out of the cell through active and passive transport.

Detailed explanation-3: -Tubular Reabsorption Reabsorption of water and ions also occurs in the distal tubule and in the collecting duct. Reabsorption of xenobiotics is usually passive and controlled by the same principles that regulate their passage across any membrane.

Detailed explanation-4: -As fluid travels down the DCT, the luminal potassium concentration increases, indicating that net K+ secretion occurs along the distal tubule. In the early DCT, the rate of K+ secretion is low, but it increases significantly in the late DCT (68–70).