When listening to the heart sounds (frequently given as lub, dup), __________.

0 votes
    the first sound is caused by closure of the tricuspid valve, the second by closure of the mitral valve.
    the first sound is caused by closure of the mitral valve, the second by closure of the tricuspid valve.
    both sounds are caused by contraction of the ventricles, followed by contraction of the atria.
    the first sound is caused by closure of the AV valves, the second by closure of the semilunar valves.
    the first sound is caused by contraction of the Purkinje fibers, the second by contraction of the papillary muscles.
asked May 27, 2013 in Anatomy & Physiology by anonymous
    

1 Answer

0 votes
the first sound is caused by closure of the AV valves, the second by closure of the semilunar valves.
answered May 28, 2013 by NewSky ~Expert~ (2,450 points)

Related questions




...