NEET Zoology Gas Exchange MCQ Question
Which of the following statements about gas exchange in the respiratory system is correct?
The exchange of gases occurs primarily in the alveoli where O2 enters the blood and CO2 is removed.
CO2 is predominantly transported in the blood as dissolved gas rather than as bicarbonate.
The conducting part of the respiratory system is responsible for the actual diffusion of gases.
Residual volume helps in maintaining a constant supply of oxygen in the lungs during expiration.
Correct Answer
Detailed Explanation
The alveoli are the primary site for gas exchange, allowing O2 to enter the blood and CO2 to be expelled. Options B and C misrepresent the functions of gas transport and the conducting part, respectively, while D incorrectly describes the role of residual volume.
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