During deglutition, the food is prevented from entering into the larynx by the cartilaginous:

What prevents the entry of food into the larynx during deglutition?
1. A thin elastic cartilaginous flap
2. A thick fibrous cartilaginous flap
3. A thick elastic cartilaginous flap
4. A thin calcified cartilaginous flap

Air conditioning – warming, humidifying and filtering of the air, is the function performed by: