Question

D. Complete the flowchart of pathway of air in
human respiratory tract given below:
Oxygen-rich air
from environment
Nasal
cavities
Trachea
Oxygen and
carbon dioxide
exchange at
alveoli
Bronchioles
Bronchioles
H
Pharynx
H
1​

Answer 1

Answer:

Air enters the respiratory system through the nose and mouth and passes down the throat (pharynx) and through the voice box, or larynx. The entrance to the larynx is covered by a small flap of tissue (epiglottis) that automatically closes during swallowing, thus preventing food or drink from entering the airways.