Na Reabsorption Is the Major Driving Force for Reabsorption of Solutes and Water in the Proximal Tubule

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-

Tubular urine

Proximal tubule cell

Glucose, amino acids phosphate Na+

Interstitial Stairs

Interstitial space

Cl Na

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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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