The figure shows a nephron with regions labeled A-D. What process occurs at the structure marked A?
Correct answer: C. Ultrafiltration under pressure
- A. Selective reabsorption
- B. Active secretion
- C. Ultrafiltration under pressure
- D. Osmotic diffusion
Explanation
At the glomerulus, blood is filtered under high pressure through capillary walls into Bowman's capsule.
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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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