Larynx function in the respiratory system?

• A. Gas exchange in the alveoli
• B. Provides air flow to and from the lungs
• C. Filters air
• D. Regulates blood pH

Answer: (B)

The key idea is that the larynx acts as part of the airway conduit, moving air to and from the lungs while also protecting the lower airway. The larynx sits between the pharynx and trachea, allowing air to flow through to the lungs and back out. It also helps guard the airway during swallowing thanks to the epiglottis, which helps prevent aspiration.

Gas exchange happens much deeper in the lungs—in the alveoli—so the larynx isn’t where oxygen and carbon dioxide are exchanged. Filtering of air is mainly done by the nose and upper airway structures that trap particles, rather than by the larynx. Blood pH is a systemic regulation, influenced by respiratory and renal processes, not a direct function of the larynx.