320 circulation 2

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Basic organization of circulatory systems: 

Basic organization of circulatory systems

Single circulation: 

Fish Start/end here Single circulation

Double circulation: 

Lung Everything else Start/end here Double circulation

Phylogeny of heart structure and function: 

Phylogeny of heart structure and function

General structure of the vertebrate heart: 

General structure of the vertebrate heart

Fish: 4 chambers in series: 

Fish: 4 chambers in series

Contractile cycle of the fish heart: 

Contractile cycle of the fish heart

Amphibian (frog): 2 separate atria, 1 common ventricle: 

Amphibian (frog): 2 separate atria, 1 common ventricle

The spiral valve in the conus arteriosus keeps streams of oxygenated and deoxygenated blood separate: 

The spiral valve in the conus arteriosus keeps streams of oxygenated and deoxygenated blood separate The spiral valve rotates ~270° as it ascends through the conus arteriosus

The spiral valve directs oxygenated and deoxygenated blood into the appropriate aortic arches: 

The spiral valve directs oxygenated and deoxygenated blood into the appropriate aortic arches

The lungfish revisited: a spiral valve in the conus arteriosus directs oxygenated blood returning from the lungs into arches III and IV: 

The lungfish revisited: a spiral valve in the conus arteriosus directs oxygenated blood returning from the lungs into arches III and IV

The reptilian heart (excluding crocodilians): 

The reptilian heart (excluding crocodilians)

Functioning of the turtle heart: 

Functioning of the turtle heart

The crocodile heart: 

Airbreathing The crocodile heart

The crocodile heart: 

Diving The crocodile heart

Mammalian/avian hearts: 4 chambers (2 parallel series of 2): 

Mammalian/avian hearts: 4 chambers (2 parallel series of 2)

Special case: Fetal circulation in mammals: 

Special case: Fetal circulation in mammals

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