Molluscs' circulatory systems are mainly open. Although molluscs are coelomates, their coeloms are reduced to fairly small spaces enclosing the heart and gonads. The main body cavity is a hemocoel through which blood and coelomic fluid circulate and which encloses most of the other internal orga...
Open Circulatory Systems | Definition, Benefits & Examples from Chapter 9 / Lesson 10 193K Learn about open circulatory systems, including the open circulatory system definition. Discover what animals have open circulatory systems with examples. Related...
Molluscs in the long history of evolution, and gradually evolved to adapt to the environment of the body structure, external structure protection, respiratory, reproductive system, nervous system, circulatory system and excretory system has reached a higher level, to the natural environment in bette ...
- a pumping heart: closed arterial system, open venous system- hemocoel (body cavity) hemocoel - functions as circulatory system- "blood sinuses" -> spaces between organs - hemolymph = blood- heart has ostia Trochophore larva -> 1 st larval stage- ciliated, top-shaped- share ancestor w...