Which of the following functions is attributed to the Eustachian tube ?

Options

A. It acts as auditory receptor.
B. It collects the vibrations in the air.
C. It maintains the balance of the body.
D. It equalises the pressure on two sides of the eardrum.

Answer

To determine the function attributed to the Eustachian tube, we can follow these steps:

### Step 1: Understand the Structure and Function of the Eustachian Tube
The Eustachian tube, also known as the auditory tube, connects the middle ear to the nasopharynx. Its primary role is to help maintain equal pressure on both sides of the eardrum.

**Hint:** Remember that the Eustachian tube connects the ear to the throat.

### Step 2: Evaluate the Given Options
We have four options to consider regarding the functions attributed to the Eustachian tube:

1. **Acts as the auditory receptor**: This is incorrect because auditory receptors are specialized hair cells located in the cochlea of the inner ear.

**Hint:** Think about where sound detection actually occurs in the ear.

2. **Collects the vibrations in the ear**: This is also incorrect. The outer ear, specifically the pinna and the ear canal, is responsible for collecting sound vibrations.

**Hint:** Consider which part of the ear is involved in capturing sound waves.

3. **Maintains the balance of the body**: This is incorrect as well. The vestibular apparatus, located in the inner ear, is responsible for maintaining balance.

**Hint:** Recall the structures involved in balance and equilibrium.

4. **Equalizes the pressure on two sides of the eardrum**: This is the correct function of the Eustachian tube. It opens during swallowing or yawning to equalize pressure, which is crucial for proper hearing and ear function.

**Hint:** Think about what happens when you experience changes in altitude, like during a flight.

### Step 3: Conclusion
After evaluating all the options, the function attributed to the Eustachian tube is that it equalizes the pressure on both sides of the eardrum.

**Final Answer:** The correct answer is option 4: It equalizes the pressure on two sides of the eardrum.