The hind legs of the frog are highly specialized for leaping. A third division of the frog's leg consists of two elongated anklebones, or tarsals. These are the astragalus and the calcaneus. The astragulas corresponds to the human talus. The calcaneus in the human skeleton is the heel bone.
Internal organs contain smooth muscle tissue.
The frog heart is the only organ contained within the coelom which has its own protective covering. There are two upper chambers of the heart, the right atrium and the left atrium. The frog heart has only one lower chamber, a single ventricle. Frog blood has both a solid abd a liquid portion. The liquid plasma carries solid elemants such as red blood cells and white blood cells.