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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 ...
Turtle skulls vary in shape, from the long and narrow skulls of softshells to the broad and flattened skull of the mata mata. [25] Some turtle species have developed large and thick heads, allowing for greater muscle mass and stronger bites. [26] Turtles that are carnivorous or durophagous (eating hard-shelled animals) have the most powerful bites.
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English: Heart diagram with labels in English. Blue components indicate de-oxygenated blood pathways and red components indicate oxygenated blood pathways ...
The loggerhead sea turtle (Caretta caretta) is a species of oceanic turtle distributed throughout the world. It is a marine reptile, belonging to the family Cheloniidae.The average loggerhead measures around 90 cm (35 in) in carapace length when fully grown.
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.
The eastern long-necked turtle (Chelodina longicollis) [6] [7] is an east Australian species of snake-necked turtle that inhabits a wide variety of water bodies and is an opportunistic feeder. [7] It is a side-necked turtle ( Pleurodira ), meaning that it bends its head sideways into its shell rather than pulling it directly back.
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.