Urinary System

• Urine is produced as a filtrate of blood plasma, but most of the filtered water is reabsorbed back into the blood by osmosis (p. 534)

• Osmosis across the wall of the renal tubules is promoted by membrane pores known as aquaporins (p. 536)

• Transport of urea occurs passively across particular regions of the renal tubules (p. 536)

• Antidiuretic hormone stimulates the permeability of the renal tubule to water (p. 536)

• Aldosterone stimulates Na+ transport in a region of the renal tubule (p. 544)

• Glucose and amino acids are reabsorbed by secondary active transport (p. 543)

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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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