Neurotransmitters
via chemicals called neurotransmitters, expressed at sites called synapses, which are tiny gaps between a neuron and another neuron or a muscle cell.
synapse
It is called involuntary muscle or smooth muscle.
Muscle fiber is another name for muscle cell. And each one is wrapped in connective tissue that is called endomysium.
synergist
The "movable" end of a muscle is called the insertion. The "immobile" end is called the origin. Shortening, or contraction, of a muscle causes the origin and insertion to become closer to one another.
Another name is myocyte. It is formed from a myoblast. There are three types: smooth, striated and cardiac cells.
heart This muscle is called cardiac muscle. Each cell can beat on its' own if in a sterile dish. If it touched another, they will beat together.
myofibril
There are two chemicals that would make the best muscle relaxant. The names of the two chemicals that would make the best muscle relaxant are Actin and Myosin.
Another name for the human heart is a cardiac muscle.
Axon terminal clusters at the ends of neuromuscular junctions are called motor endplates. They are specialized structures where motor neurons communicate with muscle fibers to initiate muscle contractions.