Which age-related change commonly occurs in renal function?

Which age-related change commonly occurs in renal function?

• A. Increased renal blood flow
• B. No change in renal blood flow
• C. Fluctuating renal blood flow
• D. Decreased renal blood flow

Answer: (D)

With aging, the kidneys undergo structural and vascular changes that reduce perfusion, so renal blood flow tends to decline. Loss of functioning nephrons, glomerulosclerosis, and stiffening of renal arteries lessen how much blood reaches the kidneys and how effectively the glomeruli filter. This leads to a gradual drop in GFR and a reduced ability to concentrate or dilute urine. While temporary fluctuations can occur, the common, baseline pattern is decreased renal blood flow rather than an increase or no change. This slower perfusion helps explain the typical age-related decline in renal function.

With aging, the kidneys undergo structural and vascular changes that reduce perfusion, so renal blood flow tends to decline. Loss of functioning nephrons, glomerulosclerosis, and stiffening of renal arteries lessen how much blood reaches the kidneys and how effectively the glomeruli filter. This leads to a gradual drop in GFR and a reduced ability to concentrate or dilute urine. While temporary fluctuations can occur, the common, baseline pattern is decreased renal blood flow rather than an increase or no change. This slower perfusion helps explain the typical age-related decline in renal function.