The circulatory pathways of vertebrates are pictured. Briefly differentiate between the pathways and identify the pathways found in: •amphibians and reptiles •fishes •some reptiles, birds and mammals. Pathway APathway BPathway C 

What will be an ideal response?


Pathway A is found in fishes. This is a single loop pathway involving a two-chambered heart.
Pathway B is found in amphibians and most reptiles. This double loop pathway sends blood to the lungs and to the body. There is some mixing of oxygen-rich and oxygen-poor blood in the single ventricle of the three-chambered heart.
Pathway C is found in some reptiles, birds and mammals. This double loop pathway involves a four-chambered heart. Only oxygen-poor blood is sent to the lungs and oxygen-rich blood is sent to the body.

Biology & Microbiology

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