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Why do we use the word heart for emotional purposes?

Like "heart VS brain" dilemmas or "you're in my heart" etc. I mean, it's just muscle and can only pump blood through our bodies. We are our brains.
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LyricalOne · F Best Comment
Even though emotions are centered in the brain, a strong rush of emotion such as fear, anger or love pumps adrenalin to the heart. This accelerates the heart beat. So prior to scientific advancements, the heart was thought to be responsible for emotions.