HEART 3 chambered heart Right atrium Left atrium Ventricle

Conus arteriosus FISH CIRCULATION Sinus venosus   RIGHTAtrium GILLS BODY organs    RIGHTAtrium GILLS   Conus arteriosus Ventricle  FISH CIRCULATION

Conus arteriosus FROG CIRCULATION Sinus venosus    Body organs   RIGHTAtrium LEFT Atrium  Lungs       Conus arteriosus  Ventricle  FROG CIRCULATION

Conus arteriosus FROG CIRCULATION Sinus venosus    Body organs   RIGHTAtrium LEFT Atrium  Lungs       Conus arteriosus  Ventricle  FROG CIRCULATION

DIFFERENCES 3 chambered heart – 2 atria; 1 ventricle 2 loops- pulmonary & systemic circulation Only blood returning from body goes through sinus venosus Blood from lungs - straight into Left atrium Ventricle & conus arteriosus carry BOTH HIGH and LOW oxygen blood Right atrium – ONLY LOW OXYGEN BLOOD Left atrium – ONLY HIGH OXYGEN BLOOD