Capillary exchange rate changes with age due to aging. Which statement is accurate?

Capillary exchange rate changes with age due to aging. Which statement is accurate?

• A. Increase the exchange process
• B. Slow the exchange process
• C. No change
• D. Stop exchange entirely

Answer: (B)

Aging affects the tiny blood vessels that feed tissues. Capillary exchange relies on enough capillary surface area and short diffusion distances to move oxygen, nutrients, and wastes between blood and tissues. With age, capillary density can decrease and the basement membrane around capillaries can thicken, which increases diffusion distance and reduces perfusion. Endothelial function often declines, further limiting arterial dilation and blood flow. All of this means the exchange process happens more slowly in older adults. It doesn’t stop entirely, nor does it speed up; it simply slows with aging.

Aging affects the tiny blood vessels that feed tissues. Capillary exchange relies on enough capillary surface area and short diffusion distances to move oxygen, nutrients, and wastes between blood and tissues. With age, capillary density can decrease and the basement membrane around capillaries can thicken, which increases diffusion distance and reduces perfusion. Endothelial function often declines, further limiting arterial dilation and blood flow. All of this means the exchange process happens more slowly in older adults. It doesn’t stop entirely, nor does it speed up; it simply slows with aging.