Dynamics of the Molluscan Circulatory System: Open versus Closed. Bourne, G. B., Redmond, J. R., & Jorgensen, D. D. Physiological Zoology, 63(1):140–166, 1990.
Dynamics of the Molluscan Circulatory System: Open versus Closed [link]Paper  abstract   bibtex   
Circulatory systems in the Mollusca vary structurally from the open system typical of most classes to the closed system in the Cephalopoda. The gastropod circulatory system serves transport and exchange functions while additionally playing various hydraulic roles. Yet the hydraulic functions of the system may not be as extensive as once believed, and many of these previously ascribed hydraulic functions are performed instead by muscular hydrostats. Nonetheless, the extent of openness reflects in large measure the nature and degree to which hydraulic capabilities are developed. In contrast, the cephalopod system carries out principally transport and delivery functions. In cephalopods, a majorfactor in ventilation-perfusion matching is increased venous return caused by the action of ventilation on adjacent capacitance blood vessels. This is a result of cephalopods' using muscles in place of the primitive cilia-driven ventilation. However, we present evidence ofa novel coupling of the cardiac and ventilatory pumps in a gastropod. Despite major differences in performance indices such as cardiac power output, our analysis indicates severalfunctional and morphological afinities between gastropod and cephalopod circulatory systems. These affinities support the placement of the two classes in the subphylum Cyrtosoma.
@article{bourne_dynamics_1990,
	title = {Dynamics of the {Molluscan} {Circulatory} {System}: {Open} versus {Closed}},
	volume = {63},
	issn = {0031-935X},
	shorttitle = {Dynamics of the {Molluscan} {Circulatory} {System}},
	url = {http://www.jstor.org.ezproxy.library.ubc.ca/stable/30158158},
	abstract = {Circulatory systems in the Mollusca vary structurally from the open system typical of most classes to the closed system in the Cephalopoda. The gastropod circulatory system serves transport and exchange functions while additionally playing various hydraulic roles. Yet the hydraulic functions of the system may not be as extensive as once believed, and many of these previously ascribed hydraulic functions are performed instead by muscular hydrostats. Nonetheless, the extent of openness reflects in large measure the nature and degree to which hydraulic capabilities are developed. In contrast, the cephalopod system carries out principally transport and delivery functions. In cephalopods, a majorfactor in ventilation-perfusion matching is increased venous return caused by the action of ventilation on adjacent capacitance blood vessels. This is a result of cephalopods' using muscles in place of the primitive cilia-driven ventilation. However, we present evidence ofa novel coupling of the cardiac and ventilatory pumps in a gastropod. Despite major differences in performance indices such as cardiac power output, our analysis indicates severalfunctional and morphological afinities between gastropod and cephalopod circulatory systems. These affinities support the placement of the two classes in the subphylum Cyrtosoma.},
	number = {1},
	urldate = {2016-06-07},
	journal = {Physiological Zoology},
	author = {Bourne, G. B. and Redmond, J. R. and Jorgensen, D. D.},
	year = {1990},
	pages = {140--166},
}

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