Summary
The thickness of ectoplasmic walls decreases at the contraction phase and increases at the expansion phase of each pulsation cycle. In average, 29% of material forming the walls of expanded veins is evacuated during contraction with the endoplasm streaming.
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Grębecki, A., Cieślawska, M. Dynamics of the ectoplasmic walls during pulsation of plasmodial veins ofPhysarum polycephalum . Protoplasma 97, 365–371 (1978). https://doi.org/10.1007/BF01276293
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DOI: https://doi.org/10.1007/BF01276293