A) action potentials pass slowly through the atrioventricular node
(this gives the atria time to contract)
Simple squamous epithelium
In contrast to popular culture, folk cultures are more likely to vary. from time to time at a given place. .... Diffusion of popular customs can adversely impact environmental quality in two ways? depletion of scarce resource
D. Bright Echo with a comet tail or ring down artifact. I hope this helps, my sister is a nurse so I know a few things.