2 atria and 1 vertricle
A pig's heart is very similar to the human heart in that it has 4 chambers while an amphibian heart has only 3 chambers. The pulmonary system in an amphibian is low pressure and has only an atrium.
Beat.
an amphibian heart has two atria but only a single ventricle
Yes, an amphibian does have a heart.
one of which is that they both have heart arteries
No. Pigeons are birds.
it would have to pump blood
The heart is composed of cardiac muscle.
heart tissue
Yes. An adult amphibian has a three-chambered heart.
The amphibian's heart does pump out a mixture of oxygen-rich and oxygen-poor blood. They are vertebrates, and this is how vertebrates' circulatory systems work.
A frog is an amphibian. An amphibian heart is characterized by three chambers. Two auricles and one ventricle constitute an amphibian heart. Hence, an amphibian heart appears like a pyramidal structure turned upside down.