Question

Read the assertion and reason carefully to mark the correct option in question

Assertion: Inspiration occurs due to muscular relaxation.

Reason: During inspiration, the diaphragm and external intercostal muscle contract simultaneously.

• A. If assertion is false but reason is true.
• B. If both assertion and reason are true but the reason is not the correct explanation of the assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.
• E. If both assertion and reason are true and the reason is the correct explanation of the assertion.

Answer 1

The correct option is A If assertion is false but reason is true.

Aseertion

Inspiration occurs due to muscular relaxation.

Elaboration:

• Inspiration or the uptake of air takes place when the thoracic cavity expands.
• This happens when the diaphragm and external intercostal contacts. The rib cage moves upward and outward.

Therefore, the assertion statement is incorrect.

Reason

During inspiration, the diaphragm and external intercostal muscle contract simultaneously.

Elaboration:

• Inspiration involves the contraction of the diagram and external intercostal muscles.
• The volume of the thoracic cavity increases.
• Pressure of the thoracic cavity reduces compared to the atmospheric pressure.
• Air rushes into the thoracic cavity.

Therefore, the reason statement is correct.