Phylum Mollusca and Cephalopoda Flashcards

Questions and Answers

What is Phylum Mollusca?

Animals with a hard exoskeleton

Cold-blooded vertebrates

Warm-blooded animals

Soft-bodied animals with an internal or external shell (correct)

What does Class Cephalopoda include?

Fish and amphibians

Corals and sponges

Reptiles and birds

Octopus and squid (correct)

What is a funnel used for in squids?

To propel squid through the water

What are chromatophores?

Pigmented cells for color change/camouflage and communication Signup and view all the answers

What are ommochromes?

Biological pigments in the eyes of crustaceans and insects Signup and view all the answers

What is the function of arms in squids?

Squids have eight arms used for grasping and feeding Signup and view all the answers

What is the mantle in squids?

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What role do gills play in squids?

They allow for the easy absorption of oxygen from the water Signup and view all the answers

What do branchial hearts do?

Pump blood to ctenidia in squids Signup and view all the answers

What is the systemic heart responsible for?

Pumps blood around the body Signup and view all the answers

What is the function of the kidney in squids?

Filters waste from the blood Signup and view all the answers

What is the significance of the squid's beak?

It serves as jaws for feeding Signup and view all the answers

What does the liver do in squids?

Breaks down toxins and processes nutrients Signup and view all the answers

What role does the stomach serve in squids?

It stores food and begins chemical digestion Signup and view all the answers

What is the cecum?

The first part of the large intestine Signup and view all the answers

What are the testes?

Male gonads Signup and view all the answers

What are the ovaries?

Female gonads Signup and view all the answers

What is a pen in a squid?

A feather-shaped internal structure for support Signup and view all the answers

What does locomotion in squids involve?

Ejecting water out of the funnel (siphon) Signup and view all the answers

Study Notes

Phylum Mollusca

Soft-bodied animals, often with an internal or external shell.
Includes various marine and terrestrial organisms.

Class Cephalopoda

Composed of marine animals like octopuses and squids.
Notable for a high oxygen demand, possessing giant nerve fibers, and a closed circulatory system.

Funnel

A specialized structure in squids used for propulsion through the water.

Chromatophores

Pigmented cells responsible for color changes, camouflage, and communication.

Ommochromes

Biological pigments found in the eyes of crustaceans and insects.

Arms

Squids have eight arms equipped with numerous and larger suckers, distinct from their two tentacles.

Tentacles

Used by squids for grasping and feeding, distinct from their arms.

Hectocotylus

A specialized arm used by male squids for transferring sperm to females.

Gills

Extensions of the squid's body with thin-walled blood vessels for oxygen absorption.

Branchial Hearts

Low-pressure hearts that pump blood specifically to the ctenidia (gills) in squids.

Systemic Heart

Pumps oxygenated blood throughout the squid's body.

Kidney

Filters waste products such as urea, water, salt, and proteins from the blood.

Jaws

Squids possess a beak-like structure used for capturing and consuming prey.

Liver

Functions to break down toxins (e.g., alcohol) and process nutrients for easier utilization by the body.

Stomach

A muscular sac responsible for food storage, mechanical breakdown, and initiation of protein and fat digestion.

Cecum

The first segment of the large intestine in squids.

Testes

Male reproductive organs that produce sperm.

Ovary

Female reproductive organ responsible for egg production.

Pen

A feather-shaped internal support structure in squids made from chitin-like material, providing muscle attachment.

Locomotion in Squids

Achieved by ejecting water out of the funnel (siphon) for rapid movement.

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Description

Explore the fascinating world of Phylum Mollusca and Class Cephalopoda with these detailed flashcards. Each card provides essential terminology and definitions related to soft-bodied animals, octopuses, squids, and their unique adaptations. Perfect for students studying marine biology or related fields.