Answer:
The correct answer is option C. loop of Henle.
Explanation:
The loop of Henle is the part of a nephron in the kidney, that starts from the proximal convoluted tubule or PCT to the distal convoluted tubule DCT. The major role of the loop of Henle is to build a concentration gradient in the kidney.
Sodium (Na+), chloride (Cl−) and potassium (K+) ions are reabsorbed by secondary active transport from the urine by a Na-K-Cl co-transporter. The electrical gradient and concentration gradient causes more reabsorption of calcium (Ca2+), magnesium (Mg2+) and Na+.
Thus, the correct answer is option C.
