Common questions

Do all mollusks have gills or lungs?

Do all mollusks have gills or lungs?

Mollusk species that are exclusively aquatic have gills for respiration, whereas some terrestrial species have lungs for respiration. Additionally, a tongue-like organ called a radula, which bears chitinous tooth-like ornamentation, is present in many species, and serves to shred or scrape food.

What is the respiratory organ of mollusc?

A ctenidium is a respiratory organ or gill which is found in many mollusks. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snail and marine snails.

What are various modes of respiration in mollusks?

The following points highlight the top two types of respiration in mollusca. The types are: 1. Aquatic Respiration 2. Terrestrial Respiration.

How do aquatic mollusks breathe bivalves?

How do aquatic mollusks breathe? They breathe by gills. Gastropods undergo torsion as they develop. This twisting bring the mantle cavity, gills, and anus to the front of the animal.

Do all mollusks have gills?

Respiration. Most molluscs have only one pair of gills, or even only a singular gill. Generally, the gills are rather like feathers in shape, although some species have gills with filaments on only one side. They divide the mantle cavity so water enters near the bottom and exits near the top.

Do molluscs breathe?

Essentially all molluscs inhale by gills that are called ctenidia (comb gills) on account of their brush-like shape. In earthbound molluscs this breath organ is decreased, yet at the same time breath happens in the pallial cavity.

Can mollusks breathe air?

All, however, whatever their systematic origin, have in common that they breathe dry air. Basically all molluscs breathe by gills that are called ctenidia (comb-gills) because of their comb-like shape. In terrestrial molluscs this respiration organ is reduced, but still respiration takes place in the pallial cavity.

Do mollusks breathe air?

Terrestrial mollusks exchange gases with the surrounding air. Aquatic mollusks “breathe” under water with gills. Gills are thin filaments that absorb gases and exchange them between the blood and surrounding water. Mollusks have a circulatory system with one or two hearts that pump blood.

Why are gills necessary in mollusks?

Gills are used to exchange oxygen and carbon dioxide in respiration. Cilia on the gills create a flow of oxygenated water through the mantle cavity, carrying off carbon dioxide and nitrogenous wastes.

How do mollusks get oxygen?

Mollusks that live in water obtain oxygen by: They obtain the oxygen by using gills. The gills remove the oxygen from the water using cilia, hairlike structures. At the same time, carbon dioxide moves out of the blood and into the water.

What do mollusks breath threw?

Aquatic mollusks breath by using gills, called ctenidia that are in their mantle cavity. Mollusks that live on land do not have gills and breathe through their mantle cavity that has a surface lined with blood vessels. Diffusion of air happens through the moist skin of mollusks.

What are the important characteristics of Mollusca?

One of the characteristics of mollusca is having a soft body and is protected by a hard shell that is bilaterally symmetrical.

  • Body has more than two cell layers,tissues and organs.
  • Body without cavity.
  • Body possesses a through gut with mouth and anus.
  • Which mollusk is a cephalopod?

    A cephalopod (/ˈsɛfələpɒd, ˈkɛf-/) is any member of the molluscan class Cephalopoda (Greek plural κεφαλόποδα, kephalópoda; “head-feet”) such as a squid, octopus, or nautilus.

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