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A ligature placed either around the junction between the sinus venosus and atrium of the frog or turtle heart (first stannius ligature) or around the atrioventricular junction (second stannius ligature); demonstrates that the cardiac impulse is conducted from sinus venosus to atria to ventricle, but that successive chambers possess automaticity ...
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For example, the face of a human being has a plane of symmetry down its centre, or a pine cone displays a clear symmetrical spiral pattern. Internal features can also show symmetry, for example the tubes in the human body (responsible for transporting gases, nutrients, and waste products) which are cylindrical and have several planes of symmetry.
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Turtleheart (Turtle's Heart or Tortle's Heart, his unami name was Tahkoxitèh) was a Delaware principal warrior and chief who lived during the French and Indian Wars, and Pontiac's War. He and Lenape Chief Killbuck represented the Delaware Nation at the Treaty of Fort Stanwix in 1768.
Heart circulation simple diagram of heart chambers: Date: 23 December 2006: Source: Patrick J. Lynch, medical illustrator: Author: Patrick J. Lynch, medical illustrator: Permission (Reusing this file) Creative Commons Attribution 2.5 License 2006
Modified version by Dake of the original heart diagram by Wapcaplet. See for another version with labels. This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic , 2.0 Generic and 1.0 Generic license.
The turtle shell is a shield for the ventral and dorsal parts of turtles (the order Testudines), completely enclosing all the vital organs of the turtle and in some cases even the head. [1] It is constructed of modified bony elements such as the ribs, parts of the pelvis and other bones found in most reptiles.