Do Frogs Have Open Or Closed Circulatory Systems ?

Do Frogs Have Open Or Closed Circulatory Systems ?

The circulatory system of frogs is of the closed type. However, the heart of a frog has only 3 chambers. There are 2 atria and one ventricle. There is a valve in the heart called the spiral valve which directs the flow of blood. This serves to prevent the oxygenated and deoxygenated blood from mixing.

Blood from the lungs and skin returns to the left atrium, while blood from the body goes to the other atrium. An interesting factor in the frog is that the skin also serves in gas exchange. So, the left atrium receives oxygenated blood, while the right receives deoxygenated blood. From there, the blood is passed into the single ventricle. 

Blood from the ventricle is pumped into a forked aorta. To be more specific, the blood from the left atrium is sent to the head and brain via the carotid arteries. This blood is relatively pure and oxygenated. The coeliacomesenteric artery splits into the celiac artery, which takes blood to the stomach and pancreas, and the mesenteric artery, which takes blood to the intestine and spleen. The iliac arteries send blood to the legs. 

The deoxygenated blood from the right atrium is sent to the skin and lungs to be oxygenated via the pulmocutaneous arteries. Even though the blood passing through the aortic arches gets mixed, it still has enough oxygen to supply to the rest of the body.  The posterior vena cava gets blood from the kidneys, liver and gonads. Deoxygenated blood from the hind limbs drains into the pelvic veins. The ventral abdominal vein deoxygenated gets blood from the body wall and urinary bladder.

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Do Frogs Have Open Or Closed Circulatory Systems