Final Answer:
The functions of the larynx include 1: serving as a passageway for air, 3: producing sound for speech, and 4: blocking food and drink from entering the airway. Options 1, 3 and 4 are answers.
Step-by-step explanation:
Serves as a Passageway for Air: The larynx functions as a crucial part of the respiratory system, providing a passageway for air to travel between the pharynx and the trachea.
Produces Sound for Speech: The primary function of the larynx is to produce sound for speech. The vocal cords, located within the larynx, vibrate as air passes through, generating sound waves that form the basis for speech.
Blocks Food and Drink from Entering the Airway: The larynx houses the epiglottis, a flap-like structure that prevents food and drink from entering the trachea during swallowing. This helps protect the respiratory system from aspiration.
Options 1, 3 and 4 are answers.