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How is the first loop in the circulatory system of a frog different from the second loop?
Wiki User
∙ 12y ago
Amphibians have a double circulation (hence 2 loops), (compare to fish's single circulation). Blood returns from the body (systemic circuit), to the heart where it is pumped to the pulmocutaneous circuit for gaeous exhange. (The pulmocutaneous circuit involves the lungs and in many amphibians the skin, which also acts as important exchange surface). After gas exchange the blood returns to the heart where it is pumped back around the systemic circuit.
So one loop is the systemic the other is the pulmocutaneous.
Now go an look at how the heart anatomy is different in amphibians, reptiles and birds/mammals!
Wiki User
∙ 12y ago
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