This video explains both the evolution and embryological development of the heart, with a focus on the parallel nature of both stories and the interactions with other organs. Sources: https://docs.google.com/document/d/e/2PACX-1vQu-jfHeYFk09PxcG6yH9hNoez2ldRcgWir3yCewP-Vc67vfRMv-x3-BRrlzypzCAMZBVLrVpZBY4Nh/pub Support us for an amount of your choosing on Patreon: www.patreon.com/cw/BroadlySpeaking Chapters: 00:00 - 00:51 Intro 00:52 - 02:17 Movement 02:18 - 03:58 Diffusion 03:59 - 07:20 Embryonic layers 07:21 - 10:09 Mesoderm 10:10 - 12:27 Pressure differences 12:28 - 15:22 Gills 15:23 - 18:45 Lungs 18:46 - 21:41 Heart formation 21:42 - 26:09 Septum 26:10 - 27:12 Symbolism 27:13 - 28:17 Outro