JAMB - Biology (1980 - No. 39)
Oxygen from the atmosphere reaches the mammalian blood stream through one of the path indicated below. Indicate the correct path, a = mouth, b = trachea, c = bronchiole, d = nostril, e = bronchus, f = alveoli
a → b → e → f → d
b → d → f → e → c
d → b → e → c → f
b → a → f → e → c
f → e → c → d → c