The Vertebrate Kidney Helps to Keep the Acidity of the Body

question 34

Multiple Choice

The vertebrate kidney helps to keep the acidity of the body fluids constant by varying the amount of hydrogen ions (H⁺) it secretes into the urine. This aspect of kidney function, like other mechanisms of homeostasis, is most likely controlled by ________.

• A)a negative feedback mechanism
• B)nerve impulses from the brain
• C)a hormone produced in the brain
• D)a hormone produced in the kidney itself

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