.

","creatorId":199,"createdAt":"2025-09-10T18:12:28.200Z","updatedAt":"2025-09-10T18:12:28.200Z"} 2c:["$2d"] 29:{"id":3290,"quizId":525,"image":null,"width":null,"height":null,"creatorId":199,"createdAt":"2025-09-10T18:12:28.190Z","updatedAt":"2025-09-10T18:12:28.190Z","tapes":"$2a","masks":"$2b","subQuestions":"$2c"} 2f:[] 30:[] 32:{"id":7444,"questionId":3291,"text":"Complete: \r\nIn the frog’s heart, the pacemaker (initiates cardiac impulse) is the……………","answer":"

sinus venosus

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because it continues to beat as long as it is perfused with Ringer’s solution.

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