Which of the following structures is analogous to the spiracles of cockroach ?

Options

A. Alveoli
B. Lungs
C. Bronchioles
D. Nostrils

Answer

To determine which structure is analogous to the spiracles of a cockroach, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of Spiracles**:
- Spiracles are external openings found on the body of a cockroach that facilitate gas exchange. They allow air to enter and exit the respiratory system.

2. **Identify the Structure in Humans**:
- In humans, the primary structures for gas exchange are the nostrils, which lead to the nasal cavity and ultimately to the lungs.

3. **Compare the Structures**:
- Both spiracles in cockroaches and nostrils in humans serve the purpose of allowing air to enter the body for respiration. However, they are structurally different.

4. **Define Analogous Structures**:
- Analogous structures are those that perform similar functions but have different evolutionary origins and structures. In this case, spiracles and nostrils fit this definition.

5. **Conclusion**:
- Therefore, the structure in humans that is analogous to the spiracles of a cockroach is the nostrils.

### Final Answer:
The structure that is analogous to the spiracles of a cockroach is the **nostrils**.

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