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.
1000 calories, as 1 calorie is the energy needed to raise 1g of water by 1 degree at normal atmospheric pressure.
the answer to question 10 is be in great health condition
