What kind of circulatory systems do the creatures in Class Bivalvia have? Is it Opened or is it Closed?
2007-02-21 13:55:55 · 8 answers · asked by aslanbeliever 1 in Science & Mathematics ➔ Zoology
Bivalves are mollusks belonging to the class Bivalvia. They typically have two-part shells, with both parts being more or less symmetrical. Bivalves are filter-feeders that use their gills to extract organic matter from the water in which they live. They have an open circulatory system that bathes the organs in hemolymph.
2007-02-21 14:03:45 · answer #1 · answered by ♥ lani s 7 · 1⤊ 0⤋
Bivalves are mollusks belonging to the class Bivalvia. They typically have two-part shells, with both parts being more or less symmetrical. The class has 30,000 species, including scallops, clams, oysters and mussels. Other names for the class include Bivalva, Pelecypoda, and Lamellibranchia.
Anatomy
Bivalves are filter-feeders that use their gills to extract organic matter from the water in which they live. They have an open circulatory system that bathes the organs in hemolymph. Nephridia remove the waste material. Bivalves are laterally compressed and have a shell composed of two valves. The valved shell makes them superficially similar to brachiopods, but the construction of the shell is completely different in the two groups: in brachiopods, the two valves are on the upper and lower surfaces of the body, while in bivalves, they are on the left and right sides.
2007-02-21 14:52:05 · answer #2 · answered by kalyan r 3 · 0⤊ 0⤋
Bivalvia, formerly and better known as the Class
Pelecypoda are molluscs. All molluscs, except
for the Cephalopoda (octopus, squid and cuttlefish), have open circulatory systems. They
have some blood vessels, in most cases, but
these open into spaces in the tissues. The blood
(hemolymph is an uncecessary term) eventually
drains into the pericardial space and enters the
heart, to be pumped out into the main blood
vessels again.
2007-02-22 04:02:11 · answer #3 · answered by Anonymous · 0⤊ 0⤋
They possess an open circulatory system.
Their "blood" (hemolymph) is more or less pooled within the organism, but it does not possess the set veins and arteries for blood transport which would make it closed. That is why the given blood pressure in bivalves is extremely low.
2007-02-21 15:06:43 · answer #4 · answered by icehoundxx 6 · 0⤊ 0⤋
Bivalves Circulatory System
2016-11-04 11:44:54 · answer #5 · answered by ? 4 · 0⤊ 0⤋
open circulatory system.
2007-02-22 14:53:26 · answer #6 · answered by bad guppy 5 · 0⤊ 0⤋
Open
2007-02-21 14:56:27 · answer #7 · answered by lightening rod 5 · 0⤊ 0⤋
http://tolweb.org/tree?group=Bivalvia&contgroup=Mollusca&dynnodeid=15751
2007-02-23 04:40:51 · answer #8 · answered by Oni 2 · 0⤊ 0⤋