Mollusks Flashcards

Questions and Answers

What type of cavity do Mollusks have?

They are coelomates.

What type of symmetry do Mollusks have?

They have bilateral symmetry.

What type of body do Mollusks have?

They have a soft internal body.

What type of digestive system do Mollusks have?

They have a digestive tract with two openings, and a mantle. Signup and view all the answers

What's a mantle in Mollusks?

The mantle is a significant part of the anatomy of Mollusks. It is the dorsal body wall which covers the organs of digestion. Signup and view all the answers

What are some animals that belong to the Mollusks?

Mussels, clams, snails, octopus, and squid. Signup and view all the answers

How do Mollusks feed (specifically snails)?

A radula scrapes food into their mouths. Signup and view all the answers

What type of internal body do Mollusks have?

Mollusks have complete guts with digestive glands, stomachs, and intestines. Signup and view all the answers

What are gills and what do they do in Mollusks?

Gills are parts of the mantle. Gills contain a rich supply of blood for the transport of oxygen to the blood and for the removal of carbon dioxide from the blood. Signup and view all the answers

What is an open circulatory system in Mollusks?

Blood is pumped out of vessels into open spaces surrounding the body organs. Signup and view all the answers

What is a closed circulatory system?

Blood is confined to vessels as it moves through the body. Signup and view all the answers

How do Mollusks get rid of wastes?

From cellular processes through structures called nephridia. Signup and view all the answers

How do Mollusks respond to stimuli?

Nervous systems coordinate their movements and behavior. Signup and view all the answers

How do Mollusks reproduce?

They reproduce sexually. All mollusks share similar developmental patterns. Signup and view all the answers

What is the class Gastropod?

Largest class, most have a single shell. Examples include snails, conches, and cones. Signup and view all the answers

What is the class Bivalves?

Two-shelled mollusks that use a muscular foot to burrow into wet sand. Examples include clams, mussels, oysters, and scallops. Signup and view all the answers

What is the class Cephalopods?

Head-footed, the foot is divided into arms and tentacles with suckers. Examples include squid, octopus, and cuttlefish. Signup and view all the answers

What are some methods of Cephalopod protection?

Expel water to propel themselves away from threat, hide, shoot out an inky substance, and change color to blend. Signup and view all the answers

Study Notes

Mollusks Overview

Mollusks are coelomates, meaning they possess a true coelomic cavity.
They exhibit bilateral symmetry, which is a characteristic body plan seen in many animals.

Body Structure and Systems

Mollusks have soft internal bodies with specialized anatomical features.
Their digestive system includes a complete tract with two openings, facilitating efficient digestion.
The mantle, a key anatomical feature, covers the organs of digestion, acting as a protective layer.

Types of Mollusks

Common examples include mussels, clams, snails, octopuses, and squids.
The class Gastropod is the largest, primarily featuring animals with a single shell like snails and conches, while slugs lack shells.
Bivalves have two shells and include species like clams, mussels, oysters, and scallops; they use a muscular foot for locomotion.
Cephalopods are head-footed mollusks with arms and tentacles equipped with suckers, including squids, octopuses, and cuttlefish.

Feeding and Digestion

Mollusks feed using a radula, a specialized structure that scrapes food into their mouths.
They have complete digestive systems, consisting of digestive glands, stomachs, and intestines, designed for effective nutrient absorption.

Respiration and Circulation

Gills, located within the mantle, are essential for respiration, facilitating the exchange of oxygen and carbon dioxide.
Mollusks often possess an open circulatory system, where blood circulates through open spaces, diffusing oxygen and nutrients directly into tissues.

Waste Excretion and Response

Waste is excreted via nephridia, which handle waste disposal from cellular processes.
Mollusks exhibit nervous systems that coordinate their movements and responses to environmental stimuli.

Reproduction

They primarily reproduce sexually, sharing common developmental patterns across different species.

Defensive Mechanisms in Cephalopods

Cephalopods have developed various protective strategies, such as expelling water to escape threats, hiding, releasing ink for concealment, and changing color to blend into their environment.

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Description

This quiz consists of flashcards that cover key concepts related to mollusks. It includes information about their body structure, cavity type, symmetry, and digestive system. Perfect for students studying marine biology or invertebrate zoology.