World of Parasites

Question 0

What is the common name for cestodes?

Answer 0

Tapeworms

Question 1

What is the common name for platyhelminthes?

Answer 1

flatworms

Question 2

What is the common name for trematodes?

Answer 2

flukes

Question 3

What is the common name for nematodes?

Answer 3

roundworms

Question 4

What is the common name for arthropoda?

Answer 4

insects, spiders, mites, and ticks

Question 5

These are single celled parasites that contain many phyla.

Answer 5

protozoa

Question 6

What are flatworms, tapeworms, flukes, and roundworms known as?

Answer 6

Helminths

Question 7

What protozoan stage would you find in formed stool?

Answer 7

Cysts (and eggs); trophs wall themselves up to form cysts as protection

Question 8

What protozoan stage would you find in liquid stool?

Answer 8

Trophs (and eggs); these are more motile and fragile, commonly found higher up in the GI tract

Question 9

What protozoan stage can be found in semiformed/soft stool?

Answer 9

cysts, trophs, and eggs

Question 10

What is the ratio of preservative to stool?

Answer 10

3 parts preservative : 1 part stool

Question 11

This preservative serves as a fixative (mercuric chloride), is a resin for adhesion to the slide, and is used for PERMANENT smears.

Answer 11

PVA-Polyvinyl Alcohol

Question 12

This preservative is used for concentrations or wet mounts, NOT smears.

Answer 12

10% buffered Formalin

Question 13

What two methods of concentration are based on specific gravity?

Answer 13

Flotation and sedimentation

Question 14

What preservative is used in the floatation concentration technique?

Answer 14

Modified Zinc Sulfate

Question 15

What is the specific gravity in concentration techniques?

Answer 15

1.18-1.20

Question 16

What are the disadvantages of using the flotation technique?

Answer 16

dense eggs sink and operculated eggs rupture

Question 17

What are advantages of doing flotation techniques?

Answer 17

allows detection of most eggs, larvae, and cysts; also eliminates debris (will settle to the bottom)

Question 18

What are the advantages of doing the sedimentation concentration techniques?

Answer 18

allows detection of most eggs, larvae, and cysts by gravity or centrifugation

Question 19

What are the disadvantages of using the sedimentation concentration techniques?

Answer 19

Smaller eggs may not sediment; more fecal debris than flotation methods

Question 20

What are the advantages of doing permanent stains?

Answer 20

Able to view internal structures (trophs or cysts)

Question 21

What is the most common/best permanent stain?

Answer 21

Trichrome