AEMCA Practice Exam

Which of the following is NOT a function of the kidneys?

1. Filtration of waste products

2. Regulation of electrolytes

3. Production of hormones

4. Absorption of nutrients from food

The correct answer is: Absorption of nutrients from food

The kidneys play vital roles in maintaining homeostasis in the body through several key functions. They are primarily responsible for the filtration of waste products from the blood, which is crucial for removing toxins and excess substances that could be harmful if allowed to accumulate. Additionally, they regulate electrolytes such as sodium, potassium, and calcium, which are essential for numerous physiological processes, including nerve function and muscle contraction. Another important function of the kidneys is the production of hormones. They produce several hormones, including erythropoietin, which stimulates red blood cell production, and renin, which plays a role in blood pressure regulation. In contrast, the absorption of nutrients from food is a function primarily associated with the digestive system, particularly the intestines, where the body breaks down food and absorbs nutrients necessary for energy and cellular function. Therefore, stating that the absorption of nutrients is a function of the kidneys is incorrect, as this process does not occur in the kidneys and is outside their primary physiological roles.