Internal anatomy of a Turtle Reptile Info Booklet! This learning resource contains an informational booklet for the internal anatomy of a turtle. Internal organs included in this booklet: turtle, brain, heart, respiratory system, trachea, lungs, digestive system, buccal cavity, esophagus, stomach, liver, gallbladder, pancreas, small intestine, large intestine, kidney, bladder, and cloaca. If you would like to expand on this topic, check out my internal parts of a turtle diagram, student booklet