Question

Which of the following are functions of the kidney? 1. Filtration of blood to remove waste products. 2. Regulation of blood pressure through the renin-angiotensin system. 3. Production of insulin to regulate blood sugar levels. 4. Regulation of water and electrolyte balance in the body. Select the correct answer using the code below:

A 1, 2, 4
B 1, 3, 4
C 2, 3, 4
D 1, 2, 3
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