Are the heart and the spirit the same thing?

You recently answered: “Do we have a spirit body and soul?” without mentioning the word “heart”. Are the heart and spirit the same thing?

As an example, Jerimiah 17:9 “the heart is deceitful above all things, and desperately wicked: who can know it?”

Also, it’s interesting, at least to me, to note that the word “soul” appears 498 times in the KJV, “spirit” appears 523 times, and “heart” 884 times.