A farmer in St. Vincent noticed that after working in the hot sun harvesting dasheen, his urine was darker yellow than usual and he produced less of it. Which process explains this observation?

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Question

A farmer in St. Vincent noticed that after working in the hot sun harvesting dasheen, his urine was darker yellow than usual and he produced less of it. Which process explains this observation?

Accepted Answer

Increased reabsorption of water in the nephron — Award 1 mark for recognising that when the body is dehydrated from sweating, more water is reabsorbed from the kidney tubules to conserve water, resulting in concentrated (darker) urine. A is incorrect — increased filtration would produce more urine. B is incorrect — decreased reabsorption would produce dilute urine. D is incorrect — urea secretion does not affect urine colour or volume significantly.

Answer

Decreased reabsorption of water in the nephron

Answer

Increased filtration by the kidneys

Answer

Increased reabsorption of water in the nephron

Answer

Decreased secretion of urea

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