Eustachian tube helps to

Options

A. Equalise pressure on both sides of tympanum
B. Keep tympanic chamber moist
C. Amplify sound vibrations
D. Maintain balance

Answer

### Step-by-Step Solution:

1. **Understanding the Eustachian Tube**:
- The Eustachian tube is a narrow passage that connects the pharynx (throat) to the middle ear. Its main function is to help regulate air pressure in the middle ear.

2. **Function of the Eustachian Tube**:
- The primary role of the Eustachian tube is to equalize the air pressure on both sides of the tympanum (eardrum). This is crucial for proper hearing and to prevent damage to the eardrum.

3. **Evaluating the Options**:
- **Option 1**: Equalizes the pressure on both sides of the tympanum.
- This is correct, as explained above.
- **Option 2**: Keeps the tympanic chamber moist.
- This is incorrect; the Eustachian tube does not have a role in moisture maintenance.
- **Option 3**: Amplifies sound vibrations.
- This is also incorrect; amplification of sound is the function of the ossicles (small bones in the middle ear).
- **Option 4**: Maintains balance.
- This is incorrect; balance is maintained by the vestibular system, not the Eustachian tube.

4. **Conclusion**:
- The correct answer is that the Eustachian tube helps to equalize the pressure on both sides of the tympanum.

### Final Answer:
The Eustachian tube helps to equalize the pressure on both sides of the tympanum (eardrum).