Neurotransmitters are chemical messengers that coordinate the transmission of signals from one nerve cell (neuron) to the next.eurotransmitters are chemical messengers that coordinate the transmission of signals from one nerve cell (neuron) to the next.
Soldiers in the secondary zone may be boarded with 16 months time-in-service and four months time-in-grade as of the first day of the board month. The time-in-service requirement for attaining eligibility for promotion to SSG is 84 months Active Federal Service for the primary zone and 48 months for the secondary zone.
The next region deep to the capsule is the adrenal cortex (2-4), which itself is subdivided into 3 zones: The first (outermost) layer of the cortex is the zona glomerulosa (2). It is fairly thin, and there are noticable spaces between the small clusters of cells. Next is the zona fasiculata (3).