Why do we become red in the face when we are embarrassed and why do we turn pale when we are frightened?
Sudden embarrassment stimulates the nerves called vasodilators and they cause the tiny blood vessels in the face and neck to expand. This allows more blood to flow through them giving the face a red appearance, and we say the person is blushing. When we are frightened, nerves called vasoconstrictors cause blood vessels in the face to constrict. The blood supply to the face is lessened and it takes on a pale appearance.
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