Which statement describes the Bainbridge reflex?

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When venous return increases, the atrial walls are stretched, especially in the right atrium. This activates atrial stretch receptors that send signals to the brainstem, leading to an increase in heart rate via heightened sympathetic input to the SA node. This Bainbridge reflex adjusts the heart rate to match the greater venous return, helping maintain cardiac output and prevent blood from backing up in the veins. So, an adjustment in heart rate in response to venous return is the correct description. This differs from choices that suggest a decrease or no change in heart rate, which wouldn’t help the heart handle the increased return. It’s also about rate, not about stroke volume, which is the realm of the Frank-Starling response.