The Heart is cone-shaped, with its base positioned upwards and tapering down to the apex. An adult Heart has a mass of 250–350 grams. The Heart is typically the size of a fist: 12 cm in length, 8 cm wide, and 6 cm in thickness. https://www.youtube.com/watch?v=pm3rDbXbZRI The Heart is the first functional organ to develop and starts to ...