(a(i))[2]
Identify on Fig. 1.1 by drawing a label line and adding a label: • a lung • the diaphragm.
(a(ii))[1]
State the name of structure A in Fig. 1.1.
(a(iii))[3]
Oxygen molecules travel through structure A on the way to the red blood cells. State the names of three other structures in the gas exchange system that oxygen molecules must pass through on their way to the red blood cells.
(a(iv))[1]
State the name of the process that moves oxygen into the red blood cells.
(b(i))[1]
State the name of the main blood vessel that delivers blood to the lungs.
(b(ii))[2]
List two other features of gas exchange surfaces.
(c)[1]
State one other way the composition of inspired air differs from the composition of expired air.