(1) Acoelomates

Question 1

Acoelomate

Answer 1

no body cavity surrounding gut
-parenchyma instead=spongy mesoderm

Example: flatworms

Question 2

Pseudocoelomate

Answer 2

body cavity not entirely lined with mesoderm

Example: roundworms

Question 3

Eucoelomate

Answer 3

body cavity entirely lined with mesoderm

Example: earthworms, arthropoda

Question 4

Locomotion (Class Turbellaria)

Answer 4

they move. ventral cilia on slime tracks and muscle waves
-sometimes swim

Question 5

Nutrition (Class Turbellaria)

Answer 5

1. Incomplete digestive tract (one opening)
2. Carnivorous (NOT parasitic)
3. Ventral pharynx - sucks up food
4. Extracellular and intracellular digestion

Question 6

Senses (Class Turbellaria)

Answer 6

Auricles (ears)= chemicals
ocelli (eyes)=light

Question 7

Reproduction (Class Turbellaria)

Answer 7

1. Transverse fission and regeneration (asexual). They split the body in 1/2

Question 8

Class Turbellaria - Phylum Platyhelminthes

Answer 8

Planaria, marine turbellarians
(flatworms)

Question 9

Class Trematoda - Phylum Platyhelminthes

Answer 9

parasitic flukes
-short leaf-like body

Question 10

Life cycle (Class Trematoda)

Answer 10

1. Adult in the liver bile duct, eggs shed with feces
2. Egg eaten by snail, hatch into ciliated larva = MIRACCIDIUM
3. Miracidium enters snail tissue, becomes sporocyst, producing REDIA
4. Redia produces CERCARIE (asexual reproduction)
5. Cercariae leave snail, burrow into the fish muscle
6. Cercariae encyst (when they go to a fish)
7. Cyst eaten by primary/definite host = humans (sexual reproduction)
   - first secondary/ intermediate host= snail (asexual)
   -second secondary/ intermediate host= fish (asexual)
8. young migrate back to bile duct, mature

Question 11

Symptoms (Class Trematoda)

Answer 11

cirrhosis of liver if an infection is heavy; nausea, fatigue, diarrhea, etc
(connective tissue growth interfering with liver function)

Question 12

Prevention (Class Trematoda)

Answer 12

cook fish, control snails
treatment -drugs that kill fluke

Question 13

Class Cestoda - Phylum Platyhelminthes

Answer 13

parasitic tapeworms

Question 14

Characteristics (Class Cestoda)

Answer 14

1. no digestive or respiratory systems (diffusion, oxygen through water)
2. long; proglottid segments (NOT true segments)

Question 15

Scolex (Class Cestoda)

Answer 15

organ of attachment (suckers, hooks)

Question 16

Life Style (Class Cestoda)

Answer 16

1. Terminal mature proglottids with eggs shed off the body from the intestine with feces
2. Eaten by a cattle
3. Larvae burrow through the intestinal wall, carried to the muscle by blood/lymph
4. Encyst
5. Cyst is eaten with meat, cyst wall dissolves, worm attaches to the intestine and matures

Question 17

Symptoms (Class Cestoda)

Answer 17

usually none; diarrhea, weight loss

Question 18

Prevention (Class Cestoda)

Answer 18

cook meat