A Physical Derivation of the Heart: The Geometrically Predetermined Dissipation Center in Multicellular Aggregates Theorem One from the Physical Derivation for Carbon-Based Life

This paper is Theorem One—an independent verification of the physical derivation for carbon-based life on the heart. Proceeding from the second law of thermodynamics and Ohm's law, it independently derives that the heart must be at the geometric center, must pulsate, must pace autonomously, must differentiate arteries from veins, and must decline in maximum rate linearly with age. These deductions agree with nine core facts of cardiac physiology and three classes of independent evidence. This paper forms a symmetric pair with Theorem Two (the brain as the densest low-resistance pathway network): the heart is the contingency shield (locking the lower bound of evolution), the brain is the contingency catcher (pioneering the upper bound). Core axioms are stated in [link to core preprint].