Which is key to oxygen extraction efficiency in aquatic respiration where there is a continuous diffusion gradient of arterial pressures that exceed expired pressure?

آبی تنفس میں آکسیجن نکالنے کی کارکردگی کی کلید کون سی ہے جہاں شریانوں کے دباؤ کا ایک مسلسل پھیلاؤ کا میلان ہے جو ختم شدہ دباؤ سے زیادہ ہے؟

Answer: Counter-current flow

Explanation
  • Counter-current flow is key in aquatic respiration, as it maintains a continuous diffusion gradient by ensuring arterial oxygen pressure exceeds expired oxygen pressure.
  • This mechanism maximizes oxygen extraction efficiency from water in fish gills.
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