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The period that would be characterized by those things would be muscle contraction. Calcium ions are the neurotransmitters that cause contraction. Calcium Ions depolarize the cell and are spread through out the muscle via the T tubules.
depolarization
transverse tubules transverse tubules
Depolarization stimulates the release of the neuro-transmitter from the terminal end of the neuron.
Tubules
Sodium ions cause depolarization and potassium ions cause repolarization.
Depolarization
The main function of the seminiferous tubules are to produce sperm.
seminiferous tubules
"Traverse" is a verb.
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An Electrocardiogram of a single heart beat shows three distinct waves. These are the P, QRS and T Waves. The QRS wave (normally the largest spike) in the electrocardiogram, is that of the ventricles depolarizing and contracting.