Figure 23.17 is a model of a proximal tubule cell. Na+ enters the cell from the lumen across the apical cell membrane and is pumped out across the basolateral cell membrane by Na+/K.+ -ATPase. The Na+ and accompanying anions and water are then taken up by the blood sur-
Glucose, amino acids phosphate Na+
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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.