• 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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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.