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Terms in this set (19)
the activation of cross bridges to generate force.
When the cross bridges become inactive and the tension generated declines
region where a motor neuron comes into close contact with a skeletal muscle cell
The space between the axonal ending and the muscle fiber.
small membranous sacs containing neurotransmitter
One type of neurotransmitter that is involved in muscle contraction
A chemical that may inhibit or stimulate a response when attached to receptors
Motor end plate
specialized portion of muscle fiber membrane that helps farm the neuromuscular junction
A change in membrane potential such that the muscle cell interior becomes less negative.
the sequence of electrical changes that occur along the sarcolemma
The restoration of the sarcolemma back to its initial polarized state
During repolarization the cell cannot be stimulated again until repolarization is complete
An enzyme located on the sarcolemma at the neuromuscular junction and in the synaptic cleft, that destroys Ach.
A motor neuron and all of the muscle fibers it supplies.
the first few milliseconds following stimulation when excitation-contraction coupling is occuring
Period of contraction
Time of contraction when cross bridges are active, from the onset to the peak of tension development, and the myogram tracing rises
Period of relaxation
A final phase in excitation-contraction couplinv when Ca2+ reenters into the sarcoplasmic reticulum
When the muscle changes in length and moves the load.
When the muscle length remains constant but the load is not moved because the load is greater than the force the muscle is able to develop.
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