Which of the following can cause a decrease in blood pressure?

The vasovagal response is a physiological reaction that can lead to a decrease in blood pressure. This response typically occurs when the body reacts to certain triggers, such as stress, fear, or pain. During a vasovagal response, there is a sudden drop in heart rate and dilation of the blood vessels, particularly those in the periphery. These changes reduce the overall blood return to the heart and lower peripheral vascular resistance, which ultimately results in a decrease in blood pressure.

This response is often characterized by symptoms such as lightheadedness, fainting, and bradycardia, which emphasize its effect of lowering blood pressure. Understanding this mechanism is important in clinical settings, as recognizing a vasovagal response can help providers manage potential consequences effectively.