HELP ME PLEASE Question 18 of 34
How do the structures of alveoli and capillaries support the function of gas
exchange?
Bronchiole
Alveoll
Smal blood
vessels (capillarles)
A. The shapes of the alveoli and the capillaries allow for a large
surface area for gas exchange.
B. Pores in the membranes allow oxygen to move out of the alveoli's
cells and carbon dioxide to move into the cells.
C. The shapes of the alveoli and the capillaries slow blood flow,
allowing for more time for gas exchange.
D. The membranes have proteins that transport carbon dioxide and
oxygen against the concentration gradients.