Class 11 Zoology simulations · Excretory Products and their Elimination

Counter-current mechanism

Move a probe down the loop of Henle and read the osmolarity of the medullary interstitium.

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What to notice

Descending limb: permeable to water; ascending limb: impermeable to water but transports electrolytes out.

Key relation

Interstitial osmolarity: ≈ 300 mOsmol/L (cortex) → ≈ 1200 mOsmol/L (inner medulla)

Try this

Move the probe to the bottom of the loop. Why can urine become concentrated there?

What you can change

• Depth into medulla: 0 to 100 %
• Limb: choose Descending limb, Ascending limb

More in Excretory Products and their Elimination

• ADH and water balance
• Nephron: filtration and reabsorption

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