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BIOL212
Majors animal: Anatomy of a bivalve (matching)
Structure | Function |
---|---|
Incurrent and excurrent siphons | Extendable, fleshy tubes that transport water into and out of the body |
Gills | Used primarily for respiration and filter feeding; female freshwater mussels brood eggs in special gill pouches |
Mantle | Thin membrane that secretes the shell |
Shell | Hard outer covering that protects soft internal organs; composed on a mixture of calcium carbonate and protein |
Foot | Muscular region adjacent to visceral mass; used for burrowing and locomotion |
Visceral mass | Pouch that houses several major internal organs |
Adductor muscles | Large, tubular muscles located at the anterior and posterior ends of the animal; close shell and hold valves tightly together |
Labial palps | Fleshy folds of skin located near the mouth that collect food particles from the gills and transport them to the mouth |
Mouth | Ingestion of food |
Esophagus | Short tube through which food passes from mouth to stomach |
Stomach | Small chamber located within visceral mass for food storage |
Digestive gland | Greenish, glandular tissue that secretes digestive enzymes into stomach and intestine to assist in the chemical breakdown of food |
Intestine | Coiled digestive tract where absorption of nutrients occurs |
Anus | Elimination of indigestible wastes (egestion) |
Gonad | Produces gametes for reproduction |
Heart | Muscular portion of circulatory system that receives blood from gills and pumps it through short arteries into neighboring tissues and organs |
Kidney (nephridium) | Excretory organ of bivalve that filters nitrogenous wastes from the hemolymph and eliminates them from the body |