Neurotransmitters are formed in a presynaptic neuron and stored in small membrane-bound sacks, called vesicles, inside this neuron. When this neuron is activated, these intracellular vesicles fuse with the cell membrane and release their contents into the synapse, a process called exocytosis.
Modern timekeeping defines a day as the sum of 24 hours â but that is not quite correct. The Earth's rotation slows down over time. So in terms of solar time, most days are a little longer than 24 hours.
We measure a day on Earth as a period of 24 hours, but it actually takes the planet 23 hours 56 minutes and 4 seconds to rotate on its axis. This measurement is actually called a sidereal day and is the length of time it takes the Earth to come back to the same position relative to the stars.