Left gill (branchial) heart pumps low O 2 blood to the gills Afferent gill blood vessel transports low O 2 blood to from gill heart to gills. Efferent.

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Left gill (branchial) heart pumps low O 2 blood to the gills Afferent gill blood vessel transports low O 2 blood to from gill heart to gills. Efferent gill blood vessel transports high O 2 blood to systemic heart. Systemic heart Caudal aorta Right lateral mantle artery Gill Note that I removed the right gill (branchial) heart

Left gill (bracnhial) heart Systemic heart Caudal aorta Lateral mantle artery Gill Note that I removed the right gill (branchial) heart.

Right lateral mantle artery Caudal aortaSystemic heart Left lateral mantle artery Left gill (branchial) heart

Systemic heart Caudal aorta Right lateral mantle artery Left lateral mantle artery Gill