BiologyMay2nd2007 - 3. ADH travels in the blood to the...

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Dustin Lee 32.2: Q1-4 Block C: Biology 1. Four organs of the excretory system include the kidneys, the ureter, the urinary bladder, and the urethra. 2. Each kidney consists of an outer region, called the renal cortex, and an inner region, called the renal medulla. Each kidney contains approximately one million microscopic filtering tubules called nephrons. A nephron consists of one tubule and its associated blood vessels. So when blood enters the kidneys, it is distributed through a network of branching arteries to the nephrons. Blood is processed and urine is excreted in four steps.
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Unformatted text preview: 3. ADH travels in the blood to the kidneys, where it stimulates nephrons to reabsorb more water. This increased reabsorption moves water from kidney filtrate into the blood. The result is a decrease in solute concentration in the blood to the normal range. 4. During dialysis the patients blood is pumped through tubes that function like nephrons. Urea and excess salts diffuse out of the blood across a membrane. Glucose and other required substances that diffuse out of the blood may also be restored....
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