The correct answer is a) reabsorption. Reabsorption refers to the process by which substances that have been filtered out of the blood during the filtration process in the kidneys are taken back into the bloodstream.
During renal filtration, blood is filtered to remove waste products and excess substances, creating a filtrate that contains both waste and necessary substances. Reabsorption occurs mainly in the renal tubules, where the body selectively absorbs water, glucose, ions, and other substances back into the circulation based on the body’s needs. This process is crucial for maintaining homeostasis and ensuring that essential nutrients are not lost in urine.