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.
The Islamic calendar was created in 639 C.E. (A.H. 17) by the Second Caliph 'Umar ibn Al-Khattab (592-644 C.E.). The civil epoch (the zero date for the Islamic calendar) is July 16, 662 C.E., when the new moon was first visible in Arabia in the first lunar month (it actually became new the day before). The day begins at sunset in the Islamic calendar. The Islamic calendar is strictly based on lunar cycles. For this reason, each year is about 11 days short of a solar year. Hence the start of each month will be different from one year to the next.