(a)[1]
Name the airway in the gas exchange system that branches into airways called bronchioles.
(b(i))[1]
The bronchiole shown in Fig. 4.1 is not part of the gas exchange surface. Name one structure in the gas exchange system, visible in Fig. 4.1, where gas exchange takes place.
(b(ii))[1]
Name the type of cell found in the tissue labelled T in Fig. 4.1.
(b(iii))[3]
State the features that allow the airway shown in Fig. 4.1 to be identified as a bronchiole rather than the other airway types present in the gas exchange system.
(c)[2]
Blood is pumped to the lungs in the pulmonary circulation. The lungs also receive blood from the systemic circulation. Explain why the pulmonary circulation and the systemic circulation need to supply blood to the lungs.