Zoology-Mechanism of Breathing
NEET Zoology Mechanism of Breathing Assertion Reason Question
Type: Assertion Reason-assertion-Hard-Class 11
Assertion (A): During inspiration, the thoracic cavity increases in volume. | Reason (R): The diaphragm contracts and moves upwards, reducing the pressure inside the thoracic cavity.
A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false.
Correct Answer
Option C
Detailed Explanation
During inspiration, the diaphragm contracts and moves downwards, not upwards, which increases the volume of the thoracic cavity and decreases the pressure, allowing air to enter the lungs. This makes option C correct.
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