Pulmonary respiration of Frog consists of

Options

A. Inspiration and expiration
B. Aspiration, inspiration and expiration
C. Aspiration and external respiration
D. Aspiration and inspiration

Answer

### Step-by-Step Solution:

1. **Understanding Pulmonary Respiration**:
- Pulmonary respiration in frogs involves the exchange of gases (oxygen and carbon dioxide) through their lungs. It is crucial for their survival as it allows them to take in oxygen and expel carbon dioxide.

2. **Identifying the Processes Involved**:
- The pulmonary respiration of frogs consists of three main processes: aspiration, inspiration, and expiration.

3. **Aspiration**:
- This is the initial phase where fresh air is drawn into the buccopharyngeal cavity from the atmosphere. It is essentially the intake of air that will later be used for gas exchange.

4. **Inspiration**:
- During inspiration, the pterohedral muscles contract. This contraction causes the mouth cavity to lower, creating a negative pressure that allows air to flow into the lungs. This phase is crucial for filling the lungs with oxygen-rich air.

5. **Expiration**:
- Expiration occurs when the pterohedral muscles relax. This relaxation causes the mouth cavity to be pushed upwards, which forces the air out of the lungs, expelling carbon dioxide and other gases.

6. **Conclusion**:
- Therefore, the pulmonary respiration of frogs consists of the processes of aspiration, inspiration, and expiration.

### Final Answer:
Pulmonary respiration of frogs consists of aspiration, inspiration, and expiration.

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