active resorption造句

It is then excreted by the kidneys which simply pass most of the urea in the glomerular filtrate on into the urine without active resorption or excretion by the renal tubules ( a relatively small proportion of the urea in the tubules diffuses passively back into the blood as its concentration in the tubules rises when water, without urea, is removed from the tubular fluid ).
It's difficult to find active resorption in a sentence. 用active resorption造句挺难的