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:C
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