Respiration and circulation the living world of molluscs. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. Start studying biology 104 chapter on rotifers and molluscs. In terrestrial molluscs this respiration organ is reduced, but still respiration takes place in the pallial cavity. Pdf the effects of fluctuating salinity on respiration. Invertebrate phylum respiration, circulation, and diffusion. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The surface of the respiratory structure is greatly increased to allow rapid absorption of o2. One of the following is usually wormlike, cylindrical or flattened a molluscs b insects c nematods d annelids. Externally the mantle cavity is recognised by its large entrance opening, the respiratory opening or pneumostome. If marine mollusca of other classes happen to be thrown ashore. The following points highlight the top two types of respiration in mollusca. Start studying invertebrate phylum respiration, circulation, and diffusion.
Mollusk species that are exclusively aquatic have gills for respiration, whereas some terrestrial species have lungs for respiration. The octopus, sea slug, and squid are all part of the phylum mollusca. That is why it is also called the snails respiratory cavity. It can be seen on the right side of the mantle in the. It also is the antagonist of the retractor muscles. Respiration aquatic gills terrestrial mantle and some with primitive lungs.
Outline of characteristics and classification of phylum mollusca. They have gills in order to get oxygen from the water. The respiratory and circulatory systems of the squid. Respiratory organs of phylum mollusca and its modification. There are on one hand muscles, that withdraw the important parts of the snail, such as tentacles, as well as all of the snails body main retractor muscle, but on the other hand no muscle can push out a tentacle again. The respiratory system of gastropods differs radically. The snails blood not only serves to transport respiratory gases and nutrients. Before entering into a definite description of airbreathing mollusca. Almost all the members of the phylum excepting scaphopoda which lacks a distinct heart have distinct heart which receives oxygenated blood from the respiratory organs and conveys it to the different parts of the body. Mollusca included cephalopods, slugs, and pteropods. Download fulltext pdf the effects of fluctuating salinity on respiration in gastropod molluscs article pdf available in comparative biochemistry and physiology part a physiology 632. Basically all molluscs breathe by gills that are called ctenidia combgills because of their comblike shape. Download pdf copy of yabatech screening exam past questions and.
The phylum mollusca consists of over 100,000 marine, freshwater, and terrestrial species. Phylum mollusca free download as powerpoint presentation. Scribd is the worlds largest social reading and publishing site. The phylum mollusca is a very large phylum consisting of invertebrate animals. Members of this phylum include squids, snails, slugs, limpets, mussels, etc. Phylum mollusca biology for majors ii lumen learning.