• 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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Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...