Baroreceptors help regulate cardiovascular function by detecting changes in what parameter?

Baroreceptors help regulate cardiovascular function by detecting changes in what parameter?

• A. Blood glucose
• B. Oxygen saturation
• C. Blood pressure
• D. Body temperature

Answer: (C)

Baroreceptors are stretch-sensitive receptors that monitor arterial pressure to keep blood pressure stable. They are located mainly in the carotid sinus and the aortic arch, and they respond to how much the arterial walls are stretched as blood pulses through. When blood pressure rises, increased stretch causes them to fire more, signaling the brainstem to raise parasympathetic activity and reduce sympathetic drive. This slows the heart and relaxes vessels, bringing blood pressure down. When pressure falls, they fire less, and the brain increases sympathetic activity, speeding the heart and constricting vessels to raise pressure. This short-term reflex control is specific to pressure changes, not to oxygen levels, glucose, or temperature, which are detected by other sensors in the body.

Baroreceptors are stretch-sensitive receptors that monitor arterial pressure to keep blood pressure stable. They are located mainly in the carotid sinus and the aortic arch, and they respond to how much the arterial walls are stretched as blood pulses through. When blood pressure rises, increased stretch causes them to fire more, signaling the brainstem to raise parasympathetic activity and reduce sympathetic drive. This slows the heart and relaxes vessels, bringing blood pressure down. When pressure falls, they fire less, and the brain increases sympathetic activity, speeding the heart and constricting vessels to raise pressure. This short-term reflex control is specific to pressure changes, not to oxygen levels, glucose, or temperature, which are detected by other sensors in the body.