Question

What is the correct passage of air during inspiration?

• A. Larynx $\to$ Trachea $\to$ Bronchiole $\to$ Bronchi $\to$ Alveoli
• B. Larynx $\to$ Pharynx $\to$ Trachea $\to$ Bronchiole $\to$ Bronchi $\to$ Alveoli
• C. Pharynx $\to$ Larynx $\to$ Trachea $\to$ Bronchi $\to$ Alveoli
• D. Pharynx $\to$ Trachea $\to$ Bronchiole $\to$ Bronchi $\to$ Alveoli

Answer 1

The correct option is C Pharynx $\to$ Larynx $\to$ Trachea $\to$ Bronchi $\to$ Alveoli

Air enters the respiratory tract via the nostrils (the external nares). It then travels through the nasal cavities and passes through the pharynx (common chamber for air and food). It is then led into a second chamber called the larynx (also called the sound-box). Food also passes via the pharynx on its way to the food pipe (oesophagus). In order to ensure that the food doesn’t accidentally enter the larynx, the cartilaginous flap called the epiglottis covers the larynx while swallowing food. Now, after the larynx, air passes to the trachea (windpipe), which eventually divides into two bronchi, each one leading to a lung. The bronchi then branch into smaller bronchi, the terminal branches of which are called bronchioles. The bronchioles are surrounded by clusters of sac-like structures called alveoli.