Answer:
In order, from least complex to most complex:
cells.
tissues.
organs.
organ systems.
organism.
Explanation:
Motor end plates are associated with muscle contraction definitely, and I would say also <em>neuron transmitter, </em>although I'm not sure about that one.
The cardiac muscle has intercalated disk that allows rapid transmission of the impulse. This will allow the cardiac muscle to have a coordinated way. The heart muscle has pacemaker that will spread the signal in regular time. The transmission of impulse is also controlled by a few checkpoint like the bundle of his to make the signal to the Purkinje fiber of left and right ventricle at the same time.