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Difficulty: MediumExcretion and Excretory Organs

During urine formation in the mammalian kidney, blood plasma is filtered and processed along the nephron. What is the correct anatomical sequence of structures through which renal filtrate flows, starting from the site of ultrafiltration to urine collection?

  1. 1Bowman's capsule
  2. 2Proximal convoluted tubule
  3. 3Loop of Henle
  4. 4Distal convoluted tubule
  5. 5Collecting duct

Answer

The correct sequence of fluid flow through the nephron is Bowman's capsule → Proximal convoluted tubule → Loop of Henle → Distal convoluted tubule → Collecting duct.
In the mammalian kidney, urine formation follows a precise anatomical pathway: blood plasma undergoes ultrafiltration at the glomerulus into Bowman's capsule, proceeds through the proximal convoluted tubule (selective reabsorption), down and up the loop of Henle (concentration gradient), through the distal convoluted tubule (tubular secretion), and finally gathers in the collecting duct to be excreted.

Step-by-Step Solution

1
Identify the site of initial filtration
High hydrostatic pressure in the glomerulus forces water and small solutes into Bowman's capsule.
Bowman's capsule receives the initial glomerular filtrate, making it the first structure in the pathway.
2
Trace filtrate movement into the first tubular segment
Filtrate flows from Bowman's capsule into the proximal convoluted tubule.
The proximal convoluted tubule directly connects to Bowman's capsule and is specialized for bulk reabsorption.
3
Follow filtrate down into the renal medulla
Filtrate moves from the proximal convoluted tubule into the U-shaped loop of Henle.
The loop of Henle dips into the medulla to regulate water retention and salt concentration gradients.
4
Trace filtrate back up into the distal tubule segment
Filtrate exits the ascending limb of Henle's loop and enters the distal convoluted tubule.
The distal convoluted tubule sits downstream of the loop of Henle in the cortex to handle fine ion adjustments.
5
Determine the final collection segment
Filtrate empties into the collecting duct, which leads to the ureter.
Multiple nephrons drain into a shared collecting duct, which carries concentrated urine toward the renal pelvis.

Key Concept

Nephron Fluid Pathway and Urine Formation
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Topics

Excretion and Excretory Organs

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