how do lizards circulate blood?

Lizards have a three-chambered heart, consisting of two atria and one ventricle, which allows for some mixing of oxygenated and deoxygenated blood. Blood is pumped from the heart to the lungs for oxygenation and then returned to the heart before being distributed to the body. Their circulatory system is adapted to their ectothermic lifestyle, enabling them to regulate blood flow according to temperature and activity levels. Additionally, lizards have a relatively low metabolic rate, which affects their overall blood circulation needs.