Timescales of the collective activity in pancreas, measured as [Ca²⁺]_c events in a typical day. Basal oscillatory activity with the period between 5 and 10 mins throughout the day (upper band) is increased after meals in a typical biphasic manner with a first peak followed by a plateau activity. On top of the basal oscillatory activity, a faster series of few seconds long bursts develops (middle band) as a temporal summation of unitary sub second events (lower band). The fast bursts can with a higher stimulation further summate to slow events of some tens of seconds during the plateau phase. Both, IP₃ and ryanodine receptors contribute to the unitary events, however the former is dominant during the initial phase and the latter during the plateau phase.