If carotid or aortic sinus pressor receptors are triggered, which of the following is NOT an expected response?

When carotid or aortic sinus pressor receptors are triggered, they play a crucial role in the regulation of blood pressure and heart rate through a negative feedback mechanism. The primary response to increased baroreceptor activity typically includes a decrease in peripheral vascular resistance, heart rate, and blood pressure in an effort to restore homeostasis.

The expected responses to activation of these receptors include:

• Vasodilation: Activation of these receptors sends signals to reduce sympathetic tone and increase parasympathetic activity, leading to vasodilation.

• Decreased heart rate (HR): Similar autonomic changes cause a reduction in heart rate due to increased vagal tone.

• Decreased blood pressure (BP): Both the decrease in heart rate and vasodilation contribute to a reduction in overall blood pressure.

In contrast, increased systemic vascular resistance (SVR) is not an expected response to activation of the carotid or aortic sinus pressor receptors. Instead, these receptors promote mechanisms that lead to decreased SVR to help lower blood pressure. Therefore, the statement about increased SVR being a response is not aligned with the physiological effects triggered by the activation of these receptors. Thus, identifying increased SVR as the response that does not occur upon receptor activation is accurate.