Question

Arrange the following to trace the path of filtrate through a renal tubule:
1) proximal convoluted tubule
2) distal convoluted tubule
3) ascending limb of nephron loop
4) descending limb of nephron loop
A) 1, 2, 3, 4
B) 2, 3, 4, 1
C) 1,4,3,2
D) 3,2, 1,4​

Answer 1

Answer:

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B) 2, 3, 4, 1

Answer 2

Answer:

The part of the filtrate through a renal tubule is:
1) proximal convoluted tubule
4) descending limb of the loop of Henle
3) ascending limb of the loop of Henle
2) distal convoluted tubule
Thus, OPTION-C is the correct choice.

Explanation:

What is a nephron?

The nephron is the structural and functional unit of the Kidney. These are the microscopic elements of the kidney that filter out the blood from the excretory substances present in it and help in the formation of concentrated urine.

Parts of a Nephron

A typical nephron consists of two parts:

• The Renal Corpuscle
• The Renal Tubule

The Renal Corpuscle consists of two parts:

1. The Glomerulus is a tuft of fine blood capillaries that carry blood into and out of the nephrons. More than 90% of the dissolved solutes like sugar, metabolites, ions, excretory by-products, and proteins are filtered out of this blood (except negatively charged proteins like albumins)
2. The Bowman's Capsule is a cup-shaped structure covering up the glomerulus.
   The filtrate passes from this capsule into the renal tubule.

The Glomerulus and Bowman's Capsule both form the Malpighian Body.

The Renal Tubule consists of the following parts (arranged sequentially):

1. The proximal convoluted tubule (PCT)
2. The Loop of Henle, which again forms three parts:
   - A descending limb of the loop of Henle
   - The hairpin or U-shaped part of the loop of Henle
   - The ascending limb of the loop of Henle
3. The distal convoluted tubule (DCT)
4. The collecting tubule

The filtrate passes through each of these four parts of the renal tubule where the vital nutrients and minerals and excess water are absorbed back into the body and the excretory materials are passed out in the form of urine.

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