medium · MCAT bio-biochem
In the proximal convoluted tubule (PCT), approximately 65% of the filtered water is reabsorbed.
What is the osmolarity of the filtrate at the end of the PCT compared to the initial filtrate in Bowman's space?
- It is significantly lower because solutes are actively transported out while the tubule remains impermeable to water.
- It depends entirely on the levels of circulating antidiuretic hormone (ADH).
- It is significantly higher because only water is reabsorbed in this segment.
- It is essentially the same (iso-osmotic) because solutes and water are reabsorbed proportionately.
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