Questions and Answers
What are chromatophores?
What are eyes constructed like in squids?
Much like our own, with cornea, lens, iris, retina, and optic nerve.
What is the function of arms in squids?
Used to manipulate prey; covered with suckers.
What are tentacles used for in squids?
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What are suckers in squids?
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What is the function of the siphon in squids?
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What does the mantle do in squids?
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What are fins used for in squids?
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How is the squid's brain characterized?
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What is the buccal mass in squids?
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What are mandibles (beak) in squids?
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What is the function of the radula?
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What does the esophagus do?
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What is the role of the liver in squids?
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What are nephridia (kidneys) in squids?
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What does the pancreas secrete?
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What is the main function of the stomach?
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What is the caecum?
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What does the intestine do?
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What are retractor muscles?
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What do gills do in squids?
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What are branchial hearts?
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What does the systemic heart do?
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What is the function of the ink sac?
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What is the rectum?
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What are gonads?
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What do nidamental glands do in females?
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What is the role of the anus?
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What is a pen in squids?
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Study Notes
Chromatophores
- Coloured pigment cells enabling color change for camouflage and communication among squid.
Eyes
- Similar structure to human eyes, comprising cornea, lens, iris, retina, and optic nerve.
Arms
- Manipulate prey; characterized by the presence of suckers for gripping.
Tentacles
- Grasp prey and mates, longer than arms, with suction cups located only at their tips.
Suckers
- Muscular suction cups on arms and tentacles, utilized for holding prey and mates.
Siphon
- Flexible tube facilitating jet propulsion; also functions for waste elimination and ink release.
Mantle
- Main body section, encasing organs within the mantle cavity; replaces traditional molluscan shell.
Fins
- Extensions of the mantle used for guidance and steering during swimming.
Brain
- Highly developed compared to other invertebrates, indicating advanced cognitive abilities.
Buccal Mass
- Composed of muscles, jaws, and radula, it operates the jaw and aids in feeding.
Mandibles (beak)
- Chitinous, beak-like jaws facilitating food intake and manipulation.
Radula
- Scraping organ acting as a conveyor belt for feeding, akin to a tongue.
Esophagus
- Tube connecting the mouth to the stomach for food passage.
Liver
- Produces digestive fluids aiding in digestion and detoxification of impurities.
Nephridia (kidneys)
- Excretory organs filtering waste products from the blood.
Pancreas
- Secretes digestive enzymes vital for food breakdown.
Stomach
- Primary organ for food digestion.
Caecum
- Long organ storing food received from the stomach for further digestion.
Intestine
- Absorbs nutrients from food and transfers them to the blood; also carries waste to the anus.
Retractor Muscles
- Large muscles connected to the siphon that enable jet propulsion.
Gills
- Feathery structures for respiration, facilitating oxygen uptake and carbon dioxide elimination.
Branchial Hearts
- Special hearts that pump blood to the gills, located at the base of each gill.
Systemic Heart
- Receives oxygenated blood from the gills and pumps it throughout the body.
Ink Sac
- Produces protective ink, expelled through the siphon into water.
Rectum
- Final segment of the digestive tract for temporary waste storage.
Gonads
- Reproductive organs; male testes produce sperm, while female ovaries generate eggs.
Nidamental Glands
- Female organs secreting the gelatinous matrix surrounding squid eggs.
Anus
- Opening for waste elimination.
Pen
- Internal shell providing structural support within the mantle, remnants of ancestral shells.
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Description
Explore the fascinating anatomy of squids with this flashcard quiz. Learn about key terms such as chromatophores, eyes, arms, and tentacles, and their specific functions. Perfect for marine biology enthusiasts and students!