First slide

Circulatory Pathways

Question

A completely four-chambered heart is present in

Easy

A

all reptiles, all birds and all mammals
B

some reptiles, all birds and all mammals
C

no reptiles, all birds and all mammals
D

some reptiles, some birds and all mammals

Solution

Pisces : 2-Chambered heart
Amphibia : 3-chambered heart
Reptilia : 3-chambered heart with incompletely divided ventricle (Crocodiles and alligators ahve 4-chambered heart)
Birds and Reptiles : 4-chambered heart

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