Q: What percentage of the cardiac output passes through the kidneys?  

Answer: B

The kidneys are highly vascular organs that receive a significant amount of blood flow. In fact, despite accounting for only 0.5% of total body weight, the kidneys receive approximately 25% of the cardiac output, making them one of the most highly perfused organs in the body. This high blood flow is necessary for the kidneys to effectively filter the blood and remove waste products, as well as to regulate fluid and electrolyte balance. Any disruption in renal blood flow can have serious consequences for kidney function and overall health.

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