Figure 3.

Ca²⁺ sparks and oscillations were persistently increased after washout of AVP. (A) Confocal linescan records from separate regions of the same arteriole (Ai) under control conditions and (Aii) 10 minutes after washout of AVP (10 nM). XY frames to the left of each panel show six contiguous arteriolar myocytes and the relevant scanline (white). Horizontal arrows: cell boundaries. F/F₀ is plotted for a single myocyte in each linescan (a and b); arrows: sparks. (B) Summary data (mean ± SEM) are for spark frequency recorded before (control) and 10 minutes after washout of AVP from different regions in the same vessels. (C) Summary data (mean ± SEM) for oscillation frequency recorded under control conditions and 10 minutes after washout of AVP.