Which of the following is a function of the kidney?

The function of the kidney that is accurately identified is its role in filtering waste from the blood. The kidneys are vital organs that play a crucial role in maintaining the body’s internal balance, known as homeostasis. They filter out waste products, excess substances, and toxins from the bloodstream, which are then excreted as urine. This filtration process helps eliminate metabolic waste products, salts, and water that the body does not need, thus ensuring that the blood remains clean and balanced.

Additionally, the kidneys help regulate electrolyte levels, blood pressure, and acid-base balance, contributing to overall health. This essential filtering function is fundamental to various bodily processes, including fluid regulation and toxin elimination. Therefore, the correct understanding of the kidneys’ primary role directly relates to their ability to filter waste from the blood effectively.