Answer:
mucus
trachea
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The event that directly triggers the release of the neurotransmitter is THE DIFFUSION OF CALCIUM IONS INTO THE AXONAL TERMINUS.
Neurotransmitters are chemical messengers which relay information throughout the entire body system. There are many neurotransmitters and different events are responsible for triggering them up.
Heterocyst-forming Cyanobacteria differentiate highly specialized cells to provide fixed nitrogen to the vegetative cells in a filament.
Every type of cell is capable of regeneration from bacteria to humans to animals.