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Extrusion, retraction and respiratory movements in Helix pomatia in relation to distribution and circulation of the blood
Author(s) -
Dale B.
Publication year - 1974
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1974.tb04125.x
Subject(s) - helix pomatia , biology , extrusion , anatomy , respiratory system , helix (gastropod) , distribution (mathematics) , gastropoda , paleontology , mathematics , materials science , snail , mathematical analysis , metallurgy
The mechanism of extrusion of a representative terrestrial pulmonate Helix pomatia has been investigated using pressure recording devices. Extrusion is essentially a hydraulic process which is achieved in a step‐wise manner; each step, consisting of two distinct phases, being an exaggeration of a respiratory cycle apparent in the extended animal. The effect of extrusion, retraction and respiratory movements on the distribution and circulation of blood has also been investigated. Extrusion in other gastropods, factors affecting cardiac output and the adaptations which facilitate retraction, are discussed.