Vasoconstriction of the superior and inferior vena cava

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Vasoconstriction of the superior and inferior vena cava

As we know that mean arterial blood pressure = CO cardiac output x total peripheral resistance (TPR), what might be a normal mechanism to compensate for elevated blood pressure?
Select one:
1. Vasoconstriction of the superior and inferior vena cava (veins)
2. Vasoconstriction of peripheral arterioles
3. Increase venous return
4. Vasodilation of peripheral arterioles
5. Renin-angiotensin-aldosterone induced Na+ reabsorption

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