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A: The passage starting with the externa...

A: The passage starting with the external nostrils
upto the terminal bronchiole constitute the
respiratory part.
R: The respiratory part transport the air to the
alveoli, clears it from the foreign material,
humidified and brings the air to body
temperature.

A

If both Assertion & Reason are true and the
reason is the correct explanation of the
assertion, then mark (1)

B

If both Assertion & Reason are trye but the
reason is not the correct explanation of the
assertion , then mark (2)

C

If Assertion is true statement but Reason is
fakse, then mark (3)

D

If both Assertion and Reason are false
statements, then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the assertion and reason provided in the question, we will break down the statements and clarify the concepts related to the respiratory system. ### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: - The assertion states that "the passage starting with the external nostrils up to the terminal bronchioles constitutes the respiratory part." - In the respiratory system, the external nostrils (external nares) are the entry points for air, and the terminal bronchioles are the last part of the conducting zone before the air reaches the alveoli. - However, the respiratory part of the respiratory system is specifically defined as the area where gas exchange occurs, which is primarily in the alveoli. 2. **Understanding the Reason (R)**: - The reason states that "the respiratory part transports the air to the alveoli, clears it from foreign material, humidifies it, and brings the air to body temperature." - This description actually pertains to the functions of the conducting part of the respiratory system, which includes the nasal cavity, trachea, bronchi, and bronchioles. - The conducting part is responsible for air conditioning (filtering, humidifying, and warming the air) before it reaches the alveoli, where gas exchange occurs. 3. **Identifying the Correctness of A and R**: - Since the assertion incorrectly identifies the conducting part as the respiratory part, it is **false**. - The reason, while describing important functions of the respiratory system, incorrectly attributes these functions to the respiratory part instead of the conducting part, making it **false** as well. 4. **Conclusion**: - Both the assertion and reason are incorrect. The correct classification is that the passage from the external nostrils to the terminal bronchioles constitutes the conducting part of the respiratory system, while the respiratory part is specifically the alveoli where gas exchange occurs. ### Final Answer: Both the assertion (A) and reason (R) are incorrect.
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