APPLIED RADIOLOGICAL ANATOMY

ANATOMY

RENAL TRACT AND RETROPERITONEUM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
of Glucose and Amino Acids are absorbed here
A
Proximal Convoluted Tubule
B
Loop of Henle
C
Distal Conboluted Tubule
D
Collecting Ducts
Explanation: 

Detailed explanation-1: -The proximal tubules reabsorb about 65% of water, sodium, potassium and chloride, 100% of glucose, 100% amino acids, and 85-90% of bicarbonate. This reabsorption occurs due to the presence of channels on the basolateral (facing the interstitium) and apical membranes (facing the tubular lumen).

Detailed explanation-2: -Active transport is the key to the reabsorptive processes in the proximal tubule. Glucose and amino acids are reabsorbed across the apical membrane of the proximal tubule by sodium-coupled secondary active transport. Na+ glucose transport is mediated by the low affinity, high capacity SGLUT2 transport protein.

Detailed explanation-3: -The proximal tubule also completes the reabsorption of glucose, amino acids, and important anions, including phosphate and citrate, because it is the sole site of transport of these filtered solutes. In addition to solute reabsorption and secretion, the proximal tubule is also a metabolic organ.

Detailed explanation-4: -Under normal circumstances, up to 180 g/day of glucose is filtered by the renal glomerulus and virtually all of it is subsequently reabsorbed in the proximal convoluted tubule.

Detailed explanation-5: -Reabsorption is the process by which nephron removes water and solutes from tubular fluid and return them to circulating blood. Substances such as glucose and amino acids, useful to the body are reabsorbed from the tubule in the proximal tubule.

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