Neurotransmitters are the chemical medium through which the signals move from one neuron to the next at the synapses. This is called neurotransmission and the way it is done is through electrochemical processes. A chemical message from other neurons, through dendrites causes a nerve impulse. This travels down the Axon to the terminal buttons at the end. This then releases the neurotransmitters which send a message to the next neuron.
1. The original goal of the Gregorian calendar was to change the date of Easter. In 1582, when Pope Gregory XIII introduced his Gregorian calendar, Europe adhered to the Julian calendar, first implemented by Julius Caesar in 46 B.C. Since the Roman emperorâs system miscalculated the length of the solar year by 11 minutes, the calendar had since fallen out of sync with the seasons.
This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus of Nazareth, with AD counting years from the start of this epoch, and BC denoting years before the start of the era.There is no year zero in this scheme, so the year AD 1 immediately follows the year 1 BC.This dating system was devised in 525, but was not widely used until after 800. The Gregorian calendar is the most widely used calendar in the world today.here is no year zero in this scheme, so the year AD 1 immediately follows the year 1 BC. This dating system was devised in 525, but was not widely used until after 800. The Gregorian calendar is the most widely used calendar in the world today.