contractile vessel(s)


contractile vessel(s)
(SIPUNCULA)
A single or pair of tubes attached to the surface of the esophagus, anteriorly communicating with the fine vessels in the tentacles and ending blindly posteriorly; compensatory sac.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • contractile tubules — (SIPUNCULA) Numerous, short and simple, or longer and branching tubules originating from the contractile vessel and extending into the body cavity; polian tubules …   Dictionary of invertebrate zoology

  • dorsal vessel — 1. The dorsal blood vessel. 2. (SIPUNCULA) see contractile vessel …   Dictionary of invertebrate zoology

  • polian vessel — see contractile vessel …   Dictionary of invertebrate zoology

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  • Pseudo-heart — Pseu do heart , n. [Pseudo + heart.] (Zo[ o]l.) Any contractile vessel of invertebrates which is not of the nature of a real heart, especially one of those pertaining to the excretory system. [1913 Webster] …   The Collaborative International Dictionary of English

  • compensatory sac — see contractile vessel …   Dictionary of invertebrate zoology

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  • human cardiovascular system — ▪ anatomy Introduction       organ system that conveys blood through vessels to and from all parts of the body, carrying nutrients and oxygen to tissues and removing carbon dioxide and other wastes. It is a closed tubular system in which the… …   Universalium

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