Majors animal: Anatomy of a bivalve (matching)
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| Incurrent and excurrent siphons | Extendable, fleshy tubes that transport water into and out of the body
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| Gills | Used primarily for respiration and filter feeding; female freshwater mussels brood eggs in special gill pouches
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| Mantle | Thin membrane that secretes the shell
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| Shell | Hard outer covering that protects soft internal organs; composed on a mixture of calcium carbonate and protein
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| Foot | Muscular region adjacent to visceral mass; used for burrowing and locomotion
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| Visceral mass | Pouch that houses several major internal organs
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| Adductor muscles | Large, tubular muscles located at the anterior and posterior ends of the animal; close shell and hold valves tightly together
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| Labial palps | Fleshy folds of skin located near the mouth that collect food particles from the gills and transport them to the mouth
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| Mouth | Ingestion of food
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| Esophagus | Short tube through which food passes from mouth to stomach
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| Stomach | Small chamber located within visceral mass for food storage
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| Digestive gland | Greenish, glandular tissue that secretes digestive enzymes into stomach and intestine to assist in the chemical breakdown of food
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| Intestine | Coiled digestive tract where absorption of nutrients occurs
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| Anus | Elimination of indigestible wastes (egestion)
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| Gonad | Produces gametes for reproduction
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| Heart | Muscular portion of circulatory system that receives blood from gills and pumps it through short arteries into neighboring tissues and organs
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| Kidney (nephridium) | Excretory organ of bivalve that filters nitrogenous wastes from the hemolymph and eliminates them from the body
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