This list includes only a few of the large variety of organic anions and

cations secreted by kidney proximal tubules.

^Creatinine is an unusual compound because it is secreted by both or-

ganic anion and cation mechanisms. The creatinine molecule bears

negatively charged and positively charged groups at physiological pH

(it is a zwitterion), and this property may enable it to interact with

both secretory mechanisms.

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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