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| Description: o Relaxed atria till. Fluid pressure opens AV valves and blood flows into the relaxed ventricles. 0 As blood flows into the arteries, pressure in the ventricles declines and the aortic and pulmonary valves close. 9 Contracting atria squeeze more blood into the still—relaxed ventricles. e Ventricles start contracting, and rising pressure pushes AV valves shut. A further rise in pressure opens aor— tic and pulmonary valves.
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