Crustacean Anatomy Quiz

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Questions and Answers

What is the purpose of the carapace?

Protects gills

What is the purpose of the uropods?

Steering during swimming

What is the purpose of the telson?

Steering during swimming

What is the purpose of the chelipeds?

For defense and grabbing food Signup and view all the answers

What is the purpose of the maxillipeds?

Guides food to the mouth Signup and view all the answers

What is the purpose of the mandibles?

(Jaws) for feeding Signup and view all the answers

What is the purpose of the swimmerets?

Swimming Signup and view all the answers

What is the purpose of the walking legs?

For walking Signup and view all the answers

What is the purpose of the gonads?

Male: testes - produce sperm; Female: produce eggs Signup and view all the answers

What is the purpose of the stomach?

Grinds food; mechanical digestion Signup and view all the answers

What is the purpose of the digestive gland?

Secrete digestive enzymes to be used in the intestine Signup and view all the answers

What is the purpose of the intestine?

Chemical digestion and absorption of the monomer nutrients Signup and view all the answers

What is the purpose of the green glands?

Filter nitrogenous wastes and other metabolic waste from the blood Signup and view all the answers

What is the purpose of the gills?

Exchange of O2 + CO2 between the water and the blood Signup and view all the answers

What is the purpose of the brain?

Sends and receives messages to/from the body Signup and view all the answers

What is the purpose of the ventral nerve cord?

Transmits messages between the brain and the body Signup and view all the answers

What is the purpose of the heart?

Pumps blood Signup and view all the answers

What is the purpose of the anus?

Releases digestion system waste Signup and view all the answers

What is the purpose of the antennae and antennules?

Contain touch receptors and chemical receptors Signup and view all the answers

What is the cephalothorax and abdomen (exoskeleton) made of?

Chitin Signup and view all the answers

Explain how gas exchange happens.

The walking legs are attached to the gills and as the crayfish walks or moves its walking legs, water is swept under the exoskeleton and into the gills. Signup and view all the answers

Explain reproduction.

Its long, basically they hug. Signup and view all the answers

What type of circulatory system do they have?

Open circulatory system Signup and view all the answers

Are they carnivores, herbivores, or omnivores?

Omnivores Signup and view all the answers

They can re-grow legs.

True Signup and view all the answers

What does it do with its old shell after it molts? Now describe the process.

It eats it. Signup and view all the answers

Although the crayfish has an inflexible cephalothorax, why is it classified as a segmented animal?

The tail is segmented and the cephalothorax is segmented underneath. Signup and view all the answers

Study Notes

Skeletal System

The carapace protects the gills and is part of the skeletal system.
Uropods aid in steering during swimming, also belonging to the skeletal system.
Telson contributes to steering during swimming and is part of the skeletal system.
Chelipeds serve for defense and food grasping; they are components of the skeletal system.
Maxillipeds help guide food to the mouth, part of the skeletal system.
Mandibles function as jaws for feeding, categorized in the skeletal system.
Swimmerets assist in swimming; females use them to attach fertilized eggs while males use them for sperm transfer, part of the skeletal system.
Walking legs are specifically designed for movement and are part of the skeletal system.

Reproductive System

Gonads are essential for reproduction: testes produce sperm in males, while females produce eggs.

Digestive System

The stomach grinds food, facilitating mechanical digestion; it contains teeth for this process.
Digestive glands secrete enzymes for intestinal digestion.
Intestine is responsible for chemical digestion and absorption of nutrients.

Excretory System

Green glands filter nitrogenous and metabolic waste from the blood, functioning similarly to kidneys in humans.

Respiratory System

Gills enable the exchange of oxygen and carbon dioxide between water and blood.

Nervous System

The brain sends and receives messages throughout the body.
Ventral nerve cord transmits messages between the brain and the body.

Circulatory System

The heart pumps blood throughout the organism, functioning within a closed circulatory system.

Digestive Waste

The anus expels the waste from the digestive system.

Sensory Structures

Antennae and antennules possess touch and chemical receptors, part of the nervous system.

Exoskeleton Composition

The cephalothorax and abdomen are made of chitin, a durable material.

Gas Exchange Mechanism

Gas exchange occurs as walking legs move, sweeping water into the gills beneath the exoskeleton.

Reproduction Process

Mating involves a close embrace, often referred to as hugging.

Circulatory System Type

Crayfish possess an open circulatory system, where blood flows freely through cavities.

Diet

Crayfish are classified as omnivores, consuming both plants and animals.

Regeneration

Crayfish can regrow legs, showcasing remarkable regenerative ability.

Molting Process

After molting, crayfish consume their old shell. The process involves shedding the exoskeleton to grow, aided by withdrawing calcium for strengthening the new shell.

Segmentation Classification

Despite an inflexible cephalothorax, crayfish are segmented animals as their tails are segmented, allowing for specialized functions across different segments. They resemble decapod crustaceans like lobsters and crabs.

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Description

Test your knowledge about the anatomical features of crustaceans with this quiz! You'll explore functions and systems of parts like the carapace, uropods, and chelipeds. Perfect for biology students studying marine life.