Otto Loewi, Hodgkin & Huxley, and the Science of Neural Signaling | Advanced A&P | Google Slides + PHET Simulation.This advanced digital lesson guides students through one of the most important scientific debates in neuroscience: Do neurons communicate chemically, electrically, or both? Students examine the early 20th-century “Soups vs. Sparks” debate, analyze Otto Loewi’s landmark frog-heart experiment, and investigate how action potentials were later explained through the Nobel Prize–winning w