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Home Q & A Board Biology-Related Homework Help General Biology
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dxcwgr dxcwgr
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6 years ago
An artificial pacemaker supplements the actions of
  a. sympathetic neurons.
  b. the atrioventricular node.
  c. the medulla oblongata.
  d. the sinoatrial node.
  e. the heart muscle itself

Question 2

During the cardiac cycle,
  a. blood flows into the ventricles even before the
  atria contract.
  b. the AV valves open when ventricular pressure is
  greater than atrial pressure.
  c. the semilunar valves open as the ventricles relax.
  d. the semilunar valves open as the atria contract.
  e. all of these occur.
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mas0375mas0375
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#1
6 years ago
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dxcwgr Author
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#2
6 years ago
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