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How do the kidneys raise blood pressure?

1. They produce hormones that signal blood vessels to dilate, and they retain potassium and water.

2. They produce hormones that signal blood vessels to constrict, and they excrete salt and water.

3. They produce hormones that signal blood vessels to constrict, and they retain salt and water.

4. They produce hormones that signal blood vessels to dilate, and they retain calcium and water.

5. They produce hormones that signal blood vessels to constrict, and they retain salt and excrete water.

3. They produce hormones that signal blood vessels to constrict, and they retain salt and water.

-The renin angiogtensin aldosterone axis

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