摇晃 发表于 2025-3-30 08:12:20
Circulation and Blood,he outside of the atrium, there is a thin-walled lumen, called venous sinus. The venous sinus collects peripheral blood and pushes it into the atrium. The wall of the artery is thick. The smooth muscle of artery is developed, with numbers myofibers, has the retraction and certain elasticity. The vas