Urine formation is the result of:
Correct answer: D. All of the above
- A. Ultrafiltration
- B. Reabsorption
- C. Tubular secretion
- D. All of the above
Explanation
Urine formation involves three main processes in the kidneys:Ultrafiltration (glomerular filtration) - blood is filtered in the glomerulus to form the initial filtrate. Reabsorption - useful substances are reclaimed from the filtrate back into the blood in the renal tubules. Tubular secretion -additional waste products are secreted into the tubules from the blood.The combination of these three processes produces urine.
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About Homeostasis
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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