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.
5. At 4 to 10 months, secondary circular reactions emerge as infants try to reproduce interesting events in his/her external environment such as shaking his/her legs makes the crib jiggle. Motor Landmarks: â¢ By 16 weeks of age, the baby can hold up his hand.