The respiratory system (involving inhalation and exhalation processes) is responsible for taking in oxygen-rich air and expelling carbon dioxide-rich air. Which of the following is the sequence in which events occur in the inhalation process?

P: Air pressure inside your lungs drops.

Q: The diaphragm contracts.

R: Air from outside rushes into your lungs.

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P, Q, R

Q, P, R

R, P, Q

Q, R, P

answer is B.

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Detailed Solution

Concept- The respiratory system (involving inhalation and exhalation processes) is responsible for taking in oxygen-rich air and expelling carbon dioxide-rich air.
We need to select the correct sequence in which events occur in the inhalation process. In the respiratory system, carbon dioxide from our body is released and more oxygen is pumped into our lungs.
The respiratory system involves two processes, namely, inspiration and expiration. With the respiratory system the diaphragm narrows, the chest cavity expands, and the air pressure inside our lungs decreases. Measuring the air pressure coming from outside runs into our lungs.
Hence, the correct option is 2.

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