Question 13 Select one answer. Which of the following are not actually cells but are fragments of cells with no nucleus?  Erythrocytes  Leukeocytes  Thrombocytes  Granulocytes  NOTE: NUMBER 4 IS INCORRECT. Question 30 Select one answer. Which cell type of the myocardium is responsible for carrying and coordinating the action potentials in the ventricles?  Nodal cells  Myocardical cells  Pacemaker cells  Conducting cells NOTE: NUMBER 3 IS INCORRECT

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