When a segment of a protoplasmic tube between two junctions
or branching points, is touched with a hair, a flow of cytoplasm
inside this fragment becomes blocked. The cytoplasmic flow
blocking could be due to K+ channel activation, increases in
intracellular Ca2+, temporary increases in concentration of inositol
trisphosphate, activation of adenylyl cyclase, see overviews in
. A mechanically stimulated fragment restores its conductivity
and the flow of cytoplasm in 54–59 s after the stimulation
(Table 1).