Q: Which hormone is responsible for increasing the heartbeat and producing a feeling of excitement in the human body?  

Answer: A

Adrenaline, also known as epinephrine, is a hormone that is produced by the adrenal glands. It is released into the bloodstream in response to stress, fear, or excitement. Adrenaline acts on various organs in the body, including the heart, by increasing the heartbeat and the force of contractions. This results in an increase in blood pressure and blood flow to the muscles, preparing the body for physical activity. Adrenaline also produces a feeling of excitement or arousal, which is why it is often referred to as the "fight or flight" hormone.

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