Question

Match each function to its site of action in the nephron. Glomerulus Distal convoluted tubule Proximal convoluted tubule Ascending limb of loop of Henle Descending limb- of loop of Henle Collecting duct Answer Bank regulation of NaCl and K* in bodily fluids by secreting K* and reabsorbing NaCl reabsorption of water only, increasing solute concentration of filtrate reabsorption of salt only, diluting filtrate secretion of drugs and poisons into nephron lumen filtration of blood p;plasma transport of filtrate to renal pelvis

Answer 1

Glomerulus: It is a network of small capillaries that is surrounded by the Bowman`s capsule. It plays a major role in filtration of blood plasma to produce a filtrate that finally forms the urine.

Proximal convulted tubule: It lies between the Bowman`s capsule and the loop of Henle. It secretes drugs and poisons such as creatinine and ammonia into the lumen of nephron.

Descending limb of Henle: It forms the first descending part of the loop of Henle. Only water is reabsorbed when the filtrate passes through this loop thereby increasing the solute concentration of filtrate.

Ascending loop of Henle: This tubule is impermeable to water molecules and only salt ions are reabsorbed from the filtrate thereby diluting the filtrate.

Distal convulted tubule: This tubule connects the loop of Henle and the collecting duct. It controls the sodium and potassium levels by secreting K⁺ ions and reabsorbing Na⁺ and Cl^- ions.

Collecting duct: It is the duct that connects nephrons with the renal pelvis. It transports filtrate to the renal pelvis for excretion.