Function of epiglottis is

Options

A. Prevents flow of air into oesophagus
B. Prevents backflow of food into laryngo pharynx
C. Prevents flow of food into trachea
D. Prevents flow of food into nasopharynx

Answer

### Step-by-Step Solution

1. **Understanding the Epiglottis**: The epiglottis is a flap-like structure made of cartilage located in the throat. It is situated behind the tongue and in front of the larynx.

2. **Function at Rest**: When a person is not swallowing, the epiglottis remains upright, allowing air to flow freely into the larynx and lungs.

3. **Function During Swallowing**: When swallowing occurs, the epiglottis folds backward to cover the entrance of the larynx. This action prevents food and liquids from entering the windpipe (trachea) and subsequently the lungs.

4. **Returning to Original Position**: After swallowing, the epiglottis returns to its upright position, allowing normal breathing to resume.

5. **Identifying the Correct Function**: The primary function of the epiglottis is to prevent the flow of food into the trachea. Thus, the correct answer to the question is that the function of the epiglottis is to prevent the flow of food into the trachea.

6. **Eliminating Incorrect Options**:
- The epiglottis does not prevent the flow of air into the esophagus.
- It does not prevent the backflow of food into the laryngopharynx.
- It does not prevent the flow of food into the nasopharynx.

### Final Answer
The function of the epiglottis is to **prevent the flow of food into the trachea**.

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