The part of internal ear not responsible for dynamic balancing is

Options

A. cochlea
B. Semicircular canal
C. Utriculus
D. Sacculus

Answer

To solve the question "The part of internal ear not responsible for dynamic balancing is," we need to analyze the components of the internal ear and their functions.

### Step-by-Step Solution:

1. **Understand the Structure of the Internal Ear**:
The internal ear consists of two main parts: the cochlea and the vestibular system.

2. **Identify the Function of Each Part**:
- **Cochlea**: The cochlea is primarily responsible for hearing. It converts sound waves into nerve impulses that are sent to the brain.
- **Vestibular System**: The vestibular system is responsible for balance and spatial orientation. It includes structures like the semicircular canals, utricle, and saccule.

3. **Focus on Dynamic Balancing**:
Dynamic balancing refers to the ability to maintain balance while in motion. The vestibular system, particularly the semicircular canals, plays a crucial role in detecting rotational movements, while the utricle and saccule help with linear accelerations.

4. **Evaluate the Options**:
- **Option 1: Cochlea**: This is primarily for hearing and is not involved in balancing.
- **Option 2: Semicircular Canals**: These are part of the vestibular system and are responsible for dynamic balance.
- **Option 3: Utriculus**: This structure also contributes to balance, particularly in detecting linear accelerations.
- **Option 4: Saccule**: Similar to the utriculus, it detects vertical accelerations and is involved in balance.

5. **Conclusion**:
Since the cochlea is responsible for hearing and does not play a role in dynamic balancing, the correct answer is **Option 1: Cochlea**.

### Final Answer:
The part of the internal ear not responsible for dynamic balancing is the **Cochlea**.