A. Pacemaker cells located in the atria fire before the pacemaker cells in the ventricles. B. It takes time for hormones to diffuse from the atria to the ventricles to trigger contraction. C.The electrical signal generated in the right atrium is delayed at the AV node before passing to the ventricles. D.The ventricular muscle cells contract more slowly than the atrial muscle cells.
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Taking this as indicative of baseline levels, step-based translations of public health recommendations suggest that US adults should be taking 8,900 to 9,900 steps/day on 5 days of the week for example, at least 3,000 of which should meet moderate intensity and bout requirements.
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free from dirt, marks, or stains.
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