Like any other reptile in the world, the Galapagos tortoise is cold blooded. By cold blooded this means they need to have an exterior heat source to maintain optimum body temperature, to allow important organs of their body to function. They do this through do placing their shell towards the sun (if in the wild). (Galápagos Giant Tortoise) The tiny pores on their shells help the body trap heat. Similar to homo sapiens, a tortoise pumps blood to all organs, but a great amount is sent to be under their shell to be warmed up before continuing to circulate. The temperature outside must be around 30°C in order the body to regulate temperature internally. (Basic tortoise anatomy biology) A tortoise's heart has 3 chambers, with a pulmonary and systematic circuit, which both contain arteries, capillaries, and veins. Their blood also contains red blood cells but with nuclei unlike homo sapiens.(Galapagos Tortoise)

Some extra facts about the tortoise's heart:

- A tortoise can breath under water for more than nearly one and a half day

- If you disconnect the head of a tortoise from it's body, the heart will continue beating

- A turtle's shell is made up of more than 60 bones that are all connected at one point, which protect it's major organs from getting damaged.