肝臓[kanzou] liver
五臓[gozou] the five viscera (liver, lungs, heart, kidney and spleen)
五臓六腑[gozouroppu] the internal organs
心臓[shinzou] heart
心臓の鼓動[shinzounokodou] heartbeat

心臓部[shinzoubu] central part
腎臓[jinzou] kidney
臓器[zouki] internal organs
臓器移植[zoukiishoku] organ transplant