Amphibians and reptiles receive blood in the | vedclass

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(B) In amphibians and reptiles (except crocodiles),the heart is $3$-chambered,consisting of two atria and one ventricle.In these organisms,the left at

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Gills/lungs/skin

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(B) In amphibians and reptiles (except crocodiles),the heart is $3$-chambered,consisting of two atria and one ventricle.In these organisms,the left atrium receives oxygenated blood from the respiratory organs,which include the lungs,skin,or gills (depending on the species and environmental conditions).The right atrium receives deoxygenated blood from the rest of the body.Therefore,the correct source for the blood entering the left atrium is the respiratory surfaces.

Amphibians and reptiles receive blood in the left atrium from......

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