Vital to the regulation of fluid and electrolyte balance, the kidneys normally filter 180 l of plasma every day in the adult and

excreting only 1.8L of urine.

Explanation:

In the presence of blood borne messengers such as Aldosteron and ADH the kidney acts autonomously and responsively.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products