When your body experiences different emotions, like excitement, nervousness, fear, etc. Your brain sends signals to the rest of your body to react. What you’re talking about specifically is an adrenal gland response. This makes your heart pump harder. Because your heart is pumping harder your body heats up. Because you’re heating up you produce more sweat.
What you’re doing is applying *context* to the situation and associating it to different things, like being happy or sad. In reality it’s more like two situations: excited or not excited. When you’re excited you’ll produce an adrenal gland response, your heart will beat faster, and you’ll get hot and start sweating.
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