Calabrese, Ronald L. Department of Biology, Emory University, Atlanta, Georgia.
Cozzens, Christine S. Biology Laboratory, Harvard University, Cambridge, Massachusetts.
- Heart and circulation in Aplysia
- Heart and circulation in decapod crustaceans
- Heart and circulation in the fruit fly
- Heart and circulation in medicinal leeches
- Links to Primary Literature
- Additional Readings
The muscular organ that propels the flow of “blood” in invertebrates. As might be expected from the great diversity of invertebrate forms, the hearts of invertebrates and their associated circulatory systems are very diverse in structure and function. When most of us think of a heart, we think of the massive muscular organ in our own chest, pulsing blood throughout the body. The blood itself carries oxygen and nutrients to the tissues and carries away wastes (carbon dioxide and nitrogenous waste). This vertebrate plan is not the only one that works, however, and the hearts and circulation systems (cardiovascular systems) of invertebrates often seem unrecognizable or strange to the uninitiated. In the first place, the circulatory system of many invertebrates is open—the “blood” sloshes through a large open cavity, the hemocoel, to nourish and replenish the organs; there are no capillaries or veins. Then, the invertebrate hearts themselves are so diverse as to defy easy classification, ranging from complete absence in roundworms to the centralized hearts of mollusks and insects and other arthropods (which have open circulatory systems) to the distributed hearts and closed circulatory systems of segmented worms, such as leeches.
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information