During swallowing _________ prevents food from entering wind pipe and ______ prevents it from entering nasal cavity.

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Function of the Epiglottis:**
- The epiglottis is a leaf-shaped flap of cartilage located behind the tongue and at the top of the pharynx (voice box). Its main function is to seal off the windpipe (trachea) during swallowing.

2. **Explain How the Epiglottis Works:**
- When a person swallows, the epiglottis folds down to cover the windpipe, preventing food from accidentally entering the airway. This is crucial for preventing choking and ensuring that food goes down the esophagus instead.

...