U.S. Government. U.S. History. Spring 2014 Final Exam Study Guide & Info Your final exam in this class is on Thursday, May 29th @ 8:00 AM (normal class time - 1st Period) I realize this is early, but I will be out of ... Posted May 6, 2014, 8:00 AM by Jamie Martin.
Neuromuscular Junction Skeletal muscle cells contract as a result of impulses from motor neurons. The place where a motor neuron stimulates a muscle cell is called a neuromuscular junction. In order for skeletal muscle cells to contract each cell must be stimulated by a process of a motor neuron.Sliding Filament Theory The theory of how muscle contracts is the sliding filament theory.The contraction of a muscle occurs as the thin filament slide past the thick filaments.n skeletal muscle, the cells never contract individually. Rather they contract as groups of muscle cells that are collectively connected to a motor nerve originating in the spinal cord. The combination of the motor nerve cell (neuron) and the muscle cells it innervates is known as the motor unit.
During contraction, the smooth-muscle cell's intermediate filaments help to draw the cell up, like closing a drawstring purse. Calcium ions regulate contraction in smooth muscle, but they do it in a slightly different way than in skeletal muscle: Calcium ions come from outside of the cell. Calcium ions bind to an enzyme complex on myosin, called calmodulin-myosin light chain kinase.