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Journal of Experimental Biology 59,291-303 (1973)
Published by Company of Biologists 1973

The Circulatory Physiology of Helix Pomatia : III. The Hydrostatic Pressure Changes in the Circulatory System of Living Helix

BARBARA A. SOMMERVILLE ¹

¹ Department of Pure and Applied Zoology, Leeds

1. The pressure changes in the mantle cavity and various parts of the circulatory system of Helix pomatia have been measured.

2. There are characteristic pressure changes associated with the breathing movements, the pattern depending upon the point at which the measurement was made and, in the case of the heart, the position of the body at the time of recording. These pressure changes fail mainly within the range 2-8 cm H₂O.

3. The pressure changes associated with contraction of the heart chambers fall within the range 1-2 cm H₂O in pulmonary vein and auricle, 10-32 cm H₂O in the ventricle, 1-3 cm H₂O in the aorta and 1-8 cm H₂O in the pericardial cavity.

4. An increased frequency and amplitude of heart beat was associated with an increased rate of blood flow.