Assertion:- during inhalation volume of chest increase pressure decrease as compared to atmospheric pressure.
Reason:-volume of chest increases due to contraction of intercostal muscles and flattening of the diaphragm pressure
options:--
1) both assertion(A) and reason(R) are true and reason (R) is the correct explanation of assertion (A).
2) both assertion(A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
3) Assertion (A) is true but reason (R) is false
4) Assertion (A) is false but reason (R) is true
Answers
Answered by
0
Explanation:
1) both assertion(A) and reason(R) are true and reason (R) is the correct explanation of assertion (A).
2) both assertion(A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
3) Assertion (A) is true but reason (R) is false
4) Assertion (A) is false but reason (R) is true
Answered by
3
Answer:
answer is first option.
Explanation:
during inspiration, the volume of thoracic cavity increases as the external intercostal muscles and diaphragm contracts (becomes flat).
As the volume increases, pressure in the thoracic cavity decreases ( pressure in thoracic cavity is less than the atmospheric pressure ) . Therefore air comes into the lungs ( pressure flow is from high to low )
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