as you see urea is added to tubular fluid from intersitium and then in medullary collecting ducts it is again re-absorbed into medullary interstitium, so it is responsible for maintaining high osmolarity of medullary interstitium, a factor responsible for COUNTER CURRENT MECHANISM of concentrating urine.
you can watch videos for counter current multiplier to understand this mechanism
ok... that didn't even explain the role of urea...
it just showed how it is made permeable to water..
carmensitaband 2 years ago
@carmensitaband : it indirectly tells the role of urea..
as you see urea is added to tubular fluid from intersitium and then in medullary collecting ducts it is again re-absorbed into medullary interstitium, so it is responsible for maintaining high osmolarity of medullary interstitium, a factor responsible for COUNTER CURRENT MECHANISM of concentrating urine.
you can watch videos for counter current multiplier to understand this mechanism
genesispmc 1 year ago