6- Chapter Six - the heart rate and its regulation

Round-15 hunt: picked; source: named-course long-video search (r15); channel screens (sellers/exam/re-upload/devotional/vendor/events), provenance check, vendor/seller/devotional recheck and quality tier C + tier-C depth check passed; strict per-title check + final strict pass; oEmbed verified.

A 15-minute video from Understanding Physiology: “6- Chapter Six - the heart rate and its regulation”.

Video by Understanding Physiology, played through YouTube's embedded player.