Respitory system:

-green sea turtles have lungs, but they aren't like mammalian lungs and they are located under the caraspace 

-the ventilation occurs when the muscles attached to the pelvic area move 

green sea turtles come to te surface to breath air 

Circulation:

-Green sea turtles have closed circulatory system, and there are the two circuits, the pulmonary circuit and the systemic circuit. 

-Pulmonary going to the lungs and back, and the systemic going to the body and back

blood flow of the green sea turtle

Digestion:

- key structures: liver, gall bladder, small & large intestine, anus, stomach, esophagus, pancreas, duodenum

-food moves from the pharynx (back of throat), down to the gullet, then into the esophagus, then the stomach, where acid gets secreted,  then the small intestine, which receives bile from the liver and nutrients get absorbed, then the large intestine, then it passes through the cloaca, a multipurpose cavity, 

Nutrition:

-Green sea turtles eat algae, sea grasses, and occasionally they forage on sponges , invertebrates, and discarded fish. 

-they are herbiviors, because of their mainly plant diet. Hatchlings are omnivores 

green sea turtle eating

Food getting:

-Green Sea turtles hang around coral reefs to scrape sea grass and algae 

-they have a finely serrated beak that allows them to scrape off algae from rocks, and to eat grasses and seaweeds

green sea turtle eating sea grass, take notice of their sharp beak that helps them to easily bite their food

Support:

-the top of the shell is the carapace, and the bottom is the plastron

-they are hydrodynamic, with a short neck and small carapace, and a non-retractile head and limbs

-their forelimbs are modified into long, paddlelike flippers for swimming

important adaptations labeled

Protection:

-the shell serves as a natural suit of amour that protects the turtle from predators. The shell is made of bone and has scutes on the outside layer, which are made of keratin.

-the shape of their flippers help them to swim through water quickly to run from predators, and to hold its prey