The kidneys respond to which occurrences in the body by releasing renin?
1. Lowered blood pressure; dehydration
2. Lowered blood pressure; decreased cardiac output
3. Increased blood pressure; increased peripheral resistance
4. Increased blood pressure; stress, anxiety
Correct Answer: 1
Rationale 1: Lowered blood pressure causes the kidney to release renin.
Rationale 2: Renin secretion is turned on by loss of blood volume, not by decreased cardiac output.
Rationale 3: Increased blood pressure turns off renin secretion.
Rationale 4: Increased blood pressure turns off renin secretion.
Global Rationale: Lowered blood pressure causes the kidney to release renin. Renin secretion is turned on by loss of blood volume, not by decreased cardiac output. Increased blood pressure turns off renin secretion.
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