Crista ampullaris

Options

A. Is a chemoreceptor
B. Maintains dynamic equilibrium
C. Is a thermoreceptor
D. Is an olfactoreceptor

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of the Ear**:
- The ear is divided into three main parts: the outer ear, middle ear, and inner ear. The crista ampullaris is located in the inner ear.

2. **Identifying the Vestibular Apparatus**:
- The inner ear contains a complex structure known as the vestibular apparatus, which is crucial for maintaining balance and equilibrium.

3. **Components of the Vestibular Apparatus**:
- The vestibular apparatus is composed of semicircular canals and otolith organs. The semicircular canals are involved in detecting rotational movements.

4. **Function of the Ampulla**:
- Each semicircular canal has a swollen base called the ampulla. The ampulla contains a specialized structure known as the crista ampullaris.

5. **Role of the Crista Ampullaris**:
- The crista ampullaris contains hair cells that are sensory receptors. These hair cells detect changes in the movement of the fluid within the semicircular canals, which helps maintain dynamic equilibrium.

6. **Distinguishing Between Receptor Types**:
- The question presents options: chemoreceptor, thermoreceptor, olfactory receptor, and asks which one is correct for the crista ampullaris.
- The crista ampullaris does not function as a chemoreceptor, thermoreceptor, or olfactory receptor.

7. **Conclusion**:
- The correct function of the crista ampullaris is that it maintains dynamic equilibrium, making it a key component in the vestibular system responsible for balance.

### Final Answer:
The crista ampullaris is primarily responsible for maintaining dynamic equilibrium.

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