Heart Racing? Knees Weak? Here's Why

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    Poets, novelists and songwriters have described it in countless turns of phrase, but at the level of biology, love is all about chemicals.

    Although the physiology of romantic love has not been extensively studied, scientists can trace the symptoms of deep attraction to their logical sources.

    “Part of the whole attraction process is strongly linked to physiological arousal as a whole,” said Timothy Loving (his real name), assistant professor of human ecology at the University of Texas, Austin. “Typically, that’s going to start with things like increased heart rate, sweatiness and so on,”

    When you catch sight of your beloved and your heart starts racing, that’s because of an adrenaline rush, said Dr. Reginald Ho, a cardiac electrophysiologist and associate professor of medicine at Thomas Jefferson University Hospital in Philadelphia, Pennsylvania.

    Here’s how it works: The brain sends signals to the adrenal gland, which secretes hormones such as adrenaline, epinephrine and norepinephrine. They flow through the blood and cause the heart to beat faster and stronger, Ho said.

    The response is somewhat similar to a fast heartbeat while running on a treadmill, although exercise has other benefits, he said.

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    Article courtesy cnn.com

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