Question

The air that we breathe in passes to the tiny sacs called
(a) bronchi
(b) alveoli
(c) bronchioles
(d) pharynx

Answer 1

The air that we breathe in passes to the tiny sacs called Alveoli.

Alveoli are the main respiratory part responsible for the exchange of gases like CO₂ and O₂ in the lungs.

Respiratory Tract and Respiration:

• In humans, the lungs are the respiratory organ that facilitates the exchange of gases.
• Trachea, a tube that stretches from the pharynx to the level of the fifth thoracic vertebrae.
• The trachea divides into right and left Primary Bronchi, which further divides into secondary, tertiary and ultimately the terminal bronchioles.
• The terminal bronchioles give rise to irregular walled, sac-like structures called Alveoli.

The air that we breathe in is filtered and humidified by epithelial cilia(nose hairs) and mucus present inside the respiratory tract.

Answer 2

The correct response for the given question is alveoli (option b).

• Alveoli are tiny sacs that are a part of our pulmonary system and have a balloon-like appearance.
• The bronchi and bronchioles are a division of the lower respiratory system in the lungs.
• The air we inhale travels through the upper respiratory system, bronchioles in both lungs, and finally alveoli.
• The oxygen we breathe diffuses to blood vessels and then into body cells through capillaries in alveoli.
• As a result, alveoli constitute the pulmonary system's primary functional units.