compartments in the thoracic cavity and the coverings of the heart

Round-11 hunt: picked; channel-level screens (sellers/exam/re-upload/devotional/vendor/events), provenance check and vendor/seller/devotional recheck passed; strict per-title check + final strict pass; oEmbed verified.

A 13-minute video from Christina Howard: “compartments in the thoracic cavity and the coverings of the heart”.

Video by Christina Howard, played through YouTube's embedded player.