Baroreceptors respond to changes in which variable?

Baroreceptors respond to changes in which variable?

• A. Blood pressure.
• B. Blood glucose.
• C. Blood pH.
• D. Oxygen concentration.

Answer: (A)

Baroreceptors are stretch-sensitive nerve endings in the walls of the carotid sinuses and aortic arch. They monitor how stretched the arterial walls are, which reflects arterial (blood) pressure. When pressure rises, they fire more, signaling the brainstem to reduce heart rate and relax vessels, lowering pressure. When pressure falls, their firing decreases, prompting the brain to increase heart rate, contractility, and vasoconstriction to raise pressure. This rapid feedback keeps blood pressure stable from moment to moment. Glucose, pH, and oxygen are tracked by different receptors and systems, not primarily by baroreceptors.

Baroreceptors are stretch-sensitive nerve endings in the walls of the carotid sinuses and aortic arch. They monitor how stretched the arterial walls are, which reflects arterial (blood) pressure. When pressure rises, they fire more, signaling the brainstem to reduce heart rate and relax vessels, lowering pressure. When pressure falls, their firing decreases, prompting the brain to increase heart rate, contractility, and vasoconstriction to raise pressure. This rapid feedback keeps blood pressure stable from moment to moment. Glucose, pH, and oxygen are tracked by different receptors and systems, not primarily by baroreceptors.