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Why? Forced mouth-breathing through a narrow straw increases carbon dioxide slightly in your blood. This signals your body to vasoconstrict (shrink blood vessels) in the extremities—including your nose. Remove the straw. Inhale. You will hear air rush in like a canyon wind.
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Why? Forced mouth-breathing through a narrow straw increases carbon dioxide slightly in your blood. This signals your body to vasoconstrict (shrink blood vessels) in the extremities—including your nose. Remove the straw. Inhale. You will hear air rush in like a canyon wind.
