(a(i))[5]
Label the structures on Fig. 6.1 with words chosen from the list: bronchiole, diaphragm, larynx, rib, trachea.
(a(ii))[1]
State the name of the organ system that organ X belongs to.
(b)[3]
State three characteristics of an efficient gas exchange surface.
(c)[4]
Describe the harmful effects that tobacco smoke has on the body.