Cases of word usage

1) the chemical substance in the body that makes the heart beat faster etc, produced by anger, fear, excitement etc (adrenaline)

2) one of the tubes carrying blood from the heart to all parts of the body (artery)

3) the movement of the blood from and to the heart (circulation)

4) the act of reciting; (an instance of) a public performance of prose learnt by heart (recitation)

5) (an act of) seizing; a heart attack (seizure)

6) (single) the heart (ticker)

7) to take up (plants etc) with their roots and plant in another place; to transfer (skin or an organ, e.g. a heart or kidney) from one place on the body or from one person to another (transplant)

8) a mechanical device used for controlling the flow of air, liquid, gas etc in one direction only; a structure in the heart or in a blood-vessel allowing the blood to flow in one direction only; a closed, airless tube used to control electricity (now replaced with transistors) (valve)