D. physics
Physics is a field of study contributes ideas and concepts to biomechanics.
I think number 8 is a. or d.
Dancing involves a lot of muscles.. it depends what kind of dancing and it’s health related because it helps with your breathing and breathing patterns.
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.