58. Which statement about capillaries is correct? A.Their walls are covered with cilia B.They warm and humidify inhaled air C.Their walls are only one cell thick D.They move mucus through the lungs
Answer: Option C Solution: Capillaries are tiny blood vessels connecting arteries to veins. These blood vessels carry oxygen and nutrients to individual cells. Capillaries are the smallest blood vessels in the body, and have walls only one or two cells thick.
