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This lesson covers osmoregulation and the role of the kidney in maintaining water balance as required by the Edexcel A-Level Biology specification (9BI0), Topic 9 -- Control Systems. You need to understand the structure of the nephron, the process of urine formation, and how ADH controls water reabsorption.
Osmoregulation is the control of the water potential of the blood and body fluids. It ensures that cells are bathed in fluid with a water potential that prevents them from gaining or losing excessive water by osmosis.
If the water potential of the blood becomes:
Each kidney contains approximately 1 million nephrons -- the functional units responsible for filtering the blood and producing urine.
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