Questions and Answers
What is the classification of Amphioxus?
What function does the dorsal fin of Amphioxus serve?
Extends the entire body and broadens the body.
What is the function of the caudal fin in Amphioxus?
Propulsion and steering.
The rostrum of Amphioxus is ___
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What does the oral hood do in Amphioxus?
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Where is the atriopore located in Amphioxus?
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What are myotomes responsible for in Amphioxus?
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What do gill bars and slits function as in Amphioxus?
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What is the function of the notochord in Amphioxus?
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What is the function of the anus in Amphioxus?
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What is the role of gonads in Amphioxus?
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What is the classification of Dogfish Shark?
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What do the pectoral fins of a shark control?
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What do the pelvic fins of a shark control?
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What are claspers in sharks?
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What is the function of the dorsal fin in sharks?
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What does the caudal fin do in sharks?
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What is the rostrum of a shark?
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What do spiracles in sharks allow?
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What is the function of gill slits in sharks?
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What does the lateral line in sharks do?
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Where is the cloacal opening located in sharks?
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What are placoid scales in sharks?
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What does the peritoneum do in sharks?
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What are mesenteries in sharks?
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What is the role of the liver in sharks?
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What do hepatic veins in sharks do?
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What does the hepatic portal vein do in sharks?
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What is the function of the gallbladder in sharks?
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What does the bile duct do in sharks?
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What is the function of the esophagus in sharks?
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What type of organ is the stomach in sharks?
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What are rugae in the stomach of sharks?
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What is the duodenum in sharks?
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What functions does the pancreas serve in sharks?
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What roles does the spleen play in sharks?
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What is the ileum in sharks?
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Study Notes
Amphioxus Classification
- Belongs to Kingdom Animalia, Phylum Chordata, Subphylum Cephalochordate
- Commonly known as the Common Lancelet
Amphioxus Anatomy
- Dorsal fin extends along the body, broadens, and becomes the ventral fin
- Caudal fin is responsible for propulsion and steering at the posterior end
- Rostrum serves as a distinctive feature, aiding in movement
- Oral hood is a funnel-shaped membrane at the anterior end for food intake and storage
- Atriopore is the opening of the atrium located in front of the ventral fin, allowing water exit
- Myotomes are segmented muscle blocks that enable motor control
- Gill bars and slits act as a filter feeding device
- Notochord provides body support and shape, serving as a muscle attachment site
- Anus is the site for waste excretion
- Gonads are involved in reproduction
Dogfish Shark Classification
- Classified under Kingdom Animalia, Phylum Chordata, Subphylum Vertebrata, Order Squaliformes
Dogfish Shark Anatomy
- Pectoral fins help control swimming direction
- Pelvic fins also aid in directional control and are termed claspers in males for sperm transfer
- Dorsal fin assists in swimming direction
- Caudal fin is the primary propulsion structure
- Rostrum features a pointed snout to reduce water resistance during swimming
- Spiracles enable water intake when the mouth is occupied
- Gill slits allow for water discharge after passing over the gills
- Lateral line detects movement and vibrations in the water
- Cloacal opening serves multiple systems for excretion and reproductive functions
Shark Physiology
- Placoid scales, also known as dermal denticles, are modified teeth that provide protection
- Peritoneum lines the body cavity and covers internal organs
- Mesenteries are tissues that attach organs to the body wall
- Liver stores oil for buoyancy, nutrients, and assists in digestion
- Hepatic veins transport blood from the liver to the sinus venosus
- Hepatic portal vein carries blood from abdominal organs to the liver
- Gallbladder stores bile, while bile duct connects the gallbladder and liver
- Esophagus links the mouth to the stomach
- Stomach is J-shaped with cardiac and pyloric regions for digestion
- Rugae are folds in the stomach that increase surface area for absorption
- Duodenum is the small intestine section where digestive secretions are added
- Pancreas produces digestive enzymes essential for food breakdown
- Spleen acts as a blood reservoir, involved in immune responses and blood filtration
- Ileum is the largest section of the intestine involved in digestion and absorption processes
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Description
Explore the fascinating anatomy and classification of Amphioxus in relation to the Dogfish Shark. This quiz covers key features such as the dorsal and caudal fins, enhancing your understanding of chordates. Test your knowledge with this focused study on these marine creatures.