<h2>Having filtered out small essential molecules from the blood - the kidneys must reabsorb the molecules which are needed while allowing those molecules which are not needed to pass out in the urine Therefore the kidneys selectively reabsorb only those molecules which the body needs back in the bloodstream</h2>
Having filtered out small essential molecules from the blood - the kidneys must reabsorb the molecules which are needed, while allowing those molecules which are not needed to pass out in the urine. Therefore, the kidneys selectively reabsorb only those molecules which the body needs back in the bloodstream.
