Some studies theorize that yawning is a reflex triggered by increased blood pH as carbonic acid is produced to expel CO₂ by exhaling. Which structures would be stimulated to induce yawning if this theory is true?
A)Arterial baroreceptors
B)Baroreceptors in the aortic arch
C)Free nerve endings in the blood vessels
D)Aortic bodies and carotid bodies

Question

Quizplus · Accepted Answer

Aortic bodies and carotid bodies are chemoreceptors that detect changes in blood pH and oxygen levels, and are responsible for triggering the reflexive act of yawning.

Some Studies Theorize That Yawning Is a Reflex Triggered by Increased