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ADH increasesof the walls of collecting ...

ADH increases______of the walls of collecting duct.

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**Step-by-Step Solution:** 1. **Identify the Hormone**: The question refers to ADH, which stands for Antidiuretic Hormone. It is also known as vasopressin. 2. **Function of ADH**: Understand that ADH is secreted in response to the body's need for osmoregulation and fluid balance. It plays a crucial role in regulating the amount of water in the body. 3. **Target Site**: Recognize that ADH acts primarily on the kidneys, specifically on the collecting ducts. 4. **Mechanism of Action**: When ADH is released, it binds to specific receptors on the cells of the collecting ducts in the kidneys. 5. **Effect on Permeability**: The binding of ADH to its receptors leads to an increase in the permeability of the walls of the collecting duct. This means that the walls become more permeable to water. 6. **Outcome of Increased Permeability**: Due to the increased permeability, more water is reabsorbed back into the bloodstream from the collecting ducts, leading to the production of more concentrated urine. 7. **Final Answer**: Therefore, the correct completion of the statement is: "ADH increases the permeability of the walls of the collecting duct." ---
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