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I believe water can go across the membrane. I hope this helps.
Answer:
A dichotomous key is a tool created by scientists to help scientists and laypeople identify objects and organisms. ... Dichotomous keys are very useful because they allow non-expert users to identify organisms by directing them to look at the known, important organisms.
Calcium is one substance that is secreted elsewhere but not in the proximal convoluted tubule.
<h3>Renal reabsorption and secretion</h3>
Renal reabsorption is defined as the movement of water and specific solutes from the renal tubule back into the plasma.
Renal secretion is defined as the process by which waste ions and hydrogen ions pass from the renal capillaries into the renal tubule to be excreted into the urine.
At the proximal convoluted tubule, calcium is reabsorbed but not secreted. Therefore, Calcium is one substance that is secreted elsewhere but not in the proximal convoluted tubule.
Learn more about renal tubule here:
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