Lab 5 - Mollusc

Question 1

Used primarily for respiration and filter feeding; female freshwater mussels brood eggs in special gill pouches

Answer 1

Gills

Question 2

Thin membrane that secretes the shell

Answer 2

Mantle

Question 3

Hard outer covering that protects soft internal organs; composed of a mixture of calcium carbonate and protein

Answer 3

Shell

Question 4

Muscular region adjacent to visceral mass; used for burrowing and locomotion

Answer 4

Foot

Question 5

Pouch that houses several major internal organs

Answer 5

Visceral Mass

Question 6

Large, tubular muscles located at the anterior and posterior ends of the animal; close shell and hold valves tightly together

Answer 6

Adductor Muscles

Question 7

Fleshy folds of skin located near the mouth that collect food particles from the gills and transport them to the mouth

Answer 7

Labial palps

Question 8

Ingestion of food

Answer 8

Mouth

Question 9

Short tube through which food passes from mouth to stomach (rarely visible on dissection)

Answer 9

Esophagus

Question 10

Small chamber located within visceral mass for food storage

Answer 10

Stomach

Question 11

Greenish, granular tissue that secretes digestive enzymes into stomach and intestine to assist in the chemical breakdown of food

Answer 11

Digestive Gland

Question 12

Coiled digestive tract where absorption of nutrients occurs

Answer 12

Intestine

Question 13

Elimination of indigestible wastes (egestion)

Answer 13

Anus

Question 14

Produces gametes for reproduction

Answer 14

Gonad

Question 15

Muscular portion of circulatory system that receives blood from the gills and pumps it through short arteries to neighboring tissues and organs

Answer 15

Heart

Question 16

Excretory organ of bivalve that filters nitrogenous wastes from the hemolymph and eliminates them from the body

Answer 16

Nephridium (kidney)