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?
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What is the purpose of the maxillipeds?
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What is the purpose of the mandibles?
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What is the purpose of the swimmerets?
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What is the purpose of the walking legs?
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What is the purpose of the gonads?
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What is the purpose of the stomach?
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What is the purpose of the digestive gland?
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What is the purpose of the intestine?
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What is the purpose of the green glands?
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What is the purpose of the gills?
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What is the purpose of the brain?
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What is the purpose of the ventral nerve cord?
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What is the purpose of the heart?
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What is the purpose of the anus?
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What is the purpose of the antennae and antennules?
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What is the cephalothorax and abdomen (exoskeleton) made of?
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Explain how gas exchange happens.
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Explain reproduction.
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What type of circulatory system do they have?
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Are they carnivores, herbivores, or omnivores?
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They can re-grow legs.
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What does it do with its old shell after it molts? Now describe the process.
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Although the crayfish has an inflexible cephalothorax, why is it classified as a segmented animal?
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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.