Human Anatomy, Physiology, and Medicine. Anything human!
I guess its not always that a when person's heart beat is fast, the person's nervous...Eg- when a person is in love and sees his/her's special someone, the person's heartbeat does increase. without he nervousness.. and usually without the perspiration!! Excitement also makes the heart beat faster, but there's no perspiration. And its not always that a person sweats when nervous..
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