Angiotensin-induced vasoconstriction and baroreceptor-mediated decrease in heart rate can reduce systemic blood pressure.
Release of angiotensin causing vasoconstriction will decrease systemic blood pressure. Angiotensin II is a potent vasoconstrictor that acts to increase blood pressure. By initiating vasoconstriction of the arterioles, it decreases blood flow, ultimately contributing to a decrease in systemic blood pressure.
Baroreceptors decreasing the heart rate can also lead to a decrease in systemic blood pressure. When baroreceptors detect high blood pressure, they signal the heart to decrease its rate, resulting in a reduction of blood pressure.
On the other hand, the release of ADH causing water reabsorption and the release of aldosterone causing sodium reabsorption both increase blood volume and blood pressure, contrary to the question's query.
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