Question

Assertion : The dorsal respiratory group (DRG) present in the dorsal portion of medulla oblongata mainly causes expiration.
Reason : The ventral respiratory group (VRG) on the ventrolateral part of medulla oblongata mainly controls inspiration.

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

Answer 1

Answer: (D)

Dorsal respiratory group is a type of group located in dorsal portion of the medulla oblongata which mainly causes inspiration. Ventral respiratory group is located in the ventrolateral part of the medulla oblongata which can cause either inspiration or expiration depending upon the neurons stimulated.