note on heart of reptile
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Answer:
Except for crocodilians, which have a four-chambered heart, all reptiles have a three-chambered heart consisting of two atria and one ventricle. ... The left subchamber is called the left ventricle, or cavum venosum; it receives blood from the right atrium and leads to the body.
Unlike our own hearts, a three-chambered reptile heart has one large ventricle, or lower and more muscular portion of the heart. ... The right atrium then pushes the blood cell into the single lower ventricle, which pushes blood into the lungs through the pulmonary arteries. There, the blood cell will pick up oxygen.
Reptiles have a three chambered heart, two atria and one partially divided ventricle. This results in some mixing of oxygenated and deoxygenated blood. However, crocodilians have a four chambered heart with fully divided ventricles like mammals and birds.