Question

(i) Study the given figure of respiratory passage carefully . Parts are labelled as a,b,c,d and e. Label these parts .
(ii) How many secondary bronchi are there in right and left human lung ?
(iii) What is the approximatge length width of human trachea (wind pipe) ?
(iv) What is the role of epiglottis?
(v) In which body cavity the lungs are located ?

Answer 1

(i) (a) Alveolar sac (b) Secondary bronchus (c ) Alveoli (air sacs ) (d ) Bronchioles (e ) Trachea.
(ii) 3 and 2 respectively
(iii) 11 cm long and 2.5 cm wide
(iv) It closes the glottic during swallowing to check the entry of food into wind pipe.
(v) Thoracic cavity.