respectively to the O contraction phase and relaxation phase of the atria relaxation phase and contraction phase of the

Question

respectively to the O contraction phase and relaxation phase of the atria relaxation phase and contraction phase of the ventricles O contraction phase and relaxation phase of the ventricles O the simultaneous contraction and relaxation phases of both the atria and the ventricles O relaxation phase and contraction phase of the atria Question 30 43 The sinoatrial SA node region of the right atrium is the normal pacemaker of the heart because this region depolarizes to threshold before other cardiac regions O develops pacemaker potentials during diastole demonstrates spontaneous electrical activity has Ca t diffusing through Ca

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