Answer:
The correct answer is the last option: By releasing a hormone that dilates blood vessels and decreases blood volume.
Step-by-step explanation:
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The endocrine system is in charge of regulating and using hormones. This system releases hormones when needed and stores them when not.
In the case of blood pressure, to decrease it, it releases a hormone that dilates the blood vessels and in turn decreases the blood volume.
We conclude that the correct answer is the last option: By releasing a hormone that dilates blood vessels and decreases blood volume.