1. HEART
3 chambered heart
Right atrium
Left atrium
Ventricle

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

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

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

6. 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