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Scuba divers ascending from depth too quickly may suffer from the 'bends', caused by:
ASaturation of blood with helium
BRelease of dissolved nitrogen from blood as bubbles when pressure decreases
CExcess CO₂ released from the blood
DLoss of oxygen in the brain
Answer & Solution
Correct answer: B. Release of dissolved nitrogen from blood as bubbles when pressure decreases
Under high underwater pressure, **N₂ dissolves more in blood** (Henry's law). On rapid ascent, dissolved N₂ bubbles out → blocks capillaries → **bends**. Divers' tanks use helium-diluted air to mitigate this.
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