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Why do our hearts race in certain situations?

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our bodies are producing adrenaline,for whatever reason,and it speeds the heart

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good answer
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because of blood circulation

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Fight or flight? Our bodies need the power! More energy, more oxygen, more blood circulated, heart pumps more blood.

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Sometimes you can have irregular arrythmias that will make your heart race. It is called tachycardia. If it is racing too fast you might need to see a specialist and make sure your heart is not having problems.

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because those certain situation are uncertain situations

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Intense Feelings*

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Emotion is very responsive in our body's

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Short answer - hormones. Longer answer.... when we are in uncertain circumstances our brains kick off the "fight or flight" response as siouxbeehoney said earlier. If you're not familiar with the term...... "fight or flight" its exactly that - in an unfamiliar situation - you panic - and run away..... or ... stand and fight! This can be triggered by anything from talking to someone you are interested in, but don't know how to talk to...... to skydiving or being shot at! The hormone/neurotransmitter we generally know as adrenaline kicks in (the science nerds call it epinephrine) and a whole slew of reactions occur in the body. The brain want's more oxygen, so the lungs try to breathe more to bring in oxygen, and the heart beats faster to move the oxygen through the blood. The reaction doesn't end with your heart and lungs, epinephrine affects the stomach, liver, kidneys, pretty much your entire body. Whether its a little crush or all out love, theres a reason you get butterflies in your stomach.....

http://en.wikipedia.org/wiki/Epinephrine
http://en.wikipedia.org/wiki/Fight-or-flight_response

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because the heart is the engine of the human machine.

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