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Results 1 - 2 of 2 for Cardiac muscle
  1. Cardiac conduction system Video 
    ... heart muscle causing a contraction. This group of muscle cells is called the cardiac conduction system. The main parts of the system are the SA node, AV node, bundle of HIS, bundle branches, and Purkinje fibers. ... the atrial muscles to contract. That's why doctors sometimes call it ...
    https://medlineplus.gov/ency/anatomyvideos/000021.htm -
  2. Heartbeat Video 
    ... pass through all the heart's chambers during one cardiac cycle. Blood first enters the heart's right atrium. A muscle contraction forces the blood through the tricuspid valve ...
    https://medlineplus.gov/ency/anatomyvideos/000067.htm -