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The conducting part of the respiratory s...

The conducting part of the respiratory system is

A

The part starting with trachea up to the terminal bronchioles

B

The part starting with external nostrils up to the terminal bronchioles

C

The part starting with the initial bronchioles up to the terminal bronchioles

D

The part starting with the external nostrils up to the respiratory bronchioles

Text Solution

AI Generated Solution

The correct Answer is:
To determine the conducting part of the respiratory system, we need to understand the structure and function of the respiratory system. ### Step-by-Step Solution: 1. **Definition of Conducting Part**: The conducting part of the respiratory system is responsible for the passage of air to the sites of gas exchange (the alveoli). It does not participate in gas exchange itself. 2. **Components of the Conducting Part**: The conducting portion includes: - External nostrils (nose) - Nasopharynx - Oropharynx - Laryngopharynx - Larynx - Trachea - Bronchi - Bronchioles (up to the terminal bronchioles) 3. **Identifying the Options**: - **Option A**: "The part starting with trachea up to terminal bronchioles" - This is incorrect because it does not include the nasal passages. - **Option B**: "The part starting with external nostrils up to the terminal bronchioles" - This includes the entire conducting pathway from the nose to the terminal bronchioles, which is correct. - **Option C**: "The part starting with the initial bronchioles up to terminal bronchioles" - This is incorrect as it excludes the upper respiratory tract. - **Option D**: "The part starting with the external nostrils up to respiratory bronchioles" - This is incorrect because it includes the respiratory bronchioles, which are part of the respiratory zone where gas exchange occurs. 4. **Conclusion**: The correct answer is **Option B**, as it accurately describes the conducting part of the respiratory system, which includes all structures from the external nostrils to the terminal bronchioles. ### Final Answer: **Option B: The part starting with external nostrils up to the terminal bronchioles.**
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