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) 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 correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is (d) A and R are false.

Explanation:

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.