Squid have 2 gill hearts and one heart for the rest of the body. why do they need hearts for the gills?

Squid have 2 gill hearts and one heart for the rest of the body. why do they need hearts for the gills? explain. Why are their hearts white while ours is red?

Squids have a systemic heart for the systemic circulation and other two hearts for the branchial circulation, one for the right ctenidium ("gill") and the other for the left ctenidium. The systemic heart alone wouldn't be able to oxygenate hemolymph enough for a squid oxygen request, because of it's fast predatory movements.

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