Slides from Exam 2

Question 1

12

Answer 1

Daphnia
Class Crustacea
Phylum Arthropoda
Locate heart

2 antennae present; chewing mouthparts; appendages on abdomen

Question 1

Answer 1

Small Intestine
Jejunum

Highly convoluted and tightly bound together by mesentery (connective membrane that suspends viscera and binds them together); Important in absorption of water

Question 2

3

Answer 2

Obelia
Phylum Cnidaria
Class Hydrozoa
Locate tentacles, medusa buds, hydranth, and gonotheca

Larva is called planula
Polyp main stage
Medusa for sexual reproduction

Question 3

Answer 3

Pancreas
Locate acini units (exocrine) and islets of longerhans (endocrine)

Embedded in mesenteries that support stomach; composed of two lobes; left runs transverse, right runs longitudinally; produces several kinds of digestive enzymes; empties into the duodenum

Question 4

Answer 4

Salivary Gland
Sublingual Gland

Mostly mucus (white); flat, thin, elongated, and finely granulated tissue clinging to the mandibular duct

Question 5

Answer 5

Salivary Gland
Submandibular Gland

50:50 acinar & mucus; darker in color; larger lobules; oval-shaped gland

Question 6

1

Answer 6

Scypha
Phylum Porifera
Locate spongocoel (central cavity) & choanocytes (collar cells)

Choanocytes=flagella drives water past cell to trap food
Amoebocytes=wander mesohyl (jelly-like layer b/t epidermal cells and choanocytes); distribute/store food
Sac type; asymmetrical; hermaphroditic; filter feeders

Question 7

4

Answer 7

Obelia Medusa
Phylum Cnidaria
Class Hydrozoa
Locate Tentacles

Polyp main stage of life cycle
Medusa for sexual reproduction
Larva called planula

Question 8

2

Answer 8

Hydra
Phylum Cnidaria
Class Hydrozoa
Locate bud, tentacles and hypostome

Only exists as polyp and is solitary

Question 10

Answer 10

Small Intestine
Duodenum
Locate Brewner’s glands (rings of cuboidal cells in submucosa),

First part of small intestine; food enters here from stomach; responsible for breakdown of food with enzymes;

Question 11

Answer 11

Rotifers
Phylum Rotifera
Locate mastax, corona, spur

Pseudocoelomates; cell constant animals; mastax=grinding organ; parthenogenesis (eggs develope w/o sperm); bilateral symmetry; organs present; 3 germ layers; tube-in-tube body

Question 12

Answer 12

Taenia pisiformis
Phylum Platyhelminthes
Class Cestoda
Locate scolex suckers, hooks proglottids

Tapeworms; acoelomates; head region=scolex; proglottids=repeating “packets of reproductive organs; 2 or more hosts

Question 13

Answer 13

Lung and Bronchiole
Locate alveoli & bronchiole

Trachea splits into left and right bronchi which lead into the left and right lung; The bronchi inside the lungs are subdivided into secondary branches called bronchioles; Right lung is 4 lobes for pigs (3 for humans); left lung is 2 lobes; Alveoli composed of squamous epithelial tissue; O₂ is picked up by the blood stream and CO₂ released in alveoli

Question 14

Answer 14

Salivary Gland
 Parotid Gland
 Mostly acinar (transparency) (amylase produce-dark purple)

Lies ventral to the ear; produces amylase

Question 15

Answer 15

Earthworm Intestinal
Phylum Annelida
Class Oligochaeta

Locate dorsal blood vessel; lumen of intestine; coelom; circular muscles; longitudinal muscles

Segmented worms; closed circulatory system; blood contains hemoglobin; hydrostatic skeleton; 3 germ layers; bilateral; T-in-T; hermaphroditic; improve soil texture

Question 16

Answer 16

Amphioxus
Phylum Chordata
Subphylum Cephalochordata
Locate gill slits, notochord, nerve chord, tail

Question 17

Answer 17

Trichinella spiralis
Phylum Nematoda
Locate larva, muscle, cyst

Obtained from undercooked pork; larva encyst in muscle

Round worms; pseudocoelomates; longitudinal muscles only; free-living or parasitic; hydrostatic skeleton; bilateral; 3 germ layers; T-in-T

Question 18

Answer 18

Clonorchis sinensis
Phylum Platyhelminthes
Class Trematoda
Locate mouth, intestine, uterus, testis

Flukes; acoelomates; all members are parasites; may have complex life cycles with several hosts

Question 19

5

Answer 19

Planaria
Phylum Platyhelminthes
Class Turbellaria
Locate eyespots, gastrovascular cavity, pharynx

Acoelomates; protostomes; mostly free-living
Eyespots are (light-sensitive regions)
Capable of primitive learning

Question 20

10

Answer 20

Snail Radula
Phylum Molluska
Class Gastropoda

Radula=conveyer belt like teeth used to scrape up food; mantle highly vascularized for respiration in terrestrial forms; torsion (180degree twist in organs during development)

Question 21

Answer 21

Small Intestine
Ileum
Locate Peyer’s patches (large purple areas in submucosa)

Absorption of remaining nutrients and water

Question 22

Answer 22

Artery & Vein

Arteries leave the heart to supply blood to tissues (oxygen rich) ; veins travel to the heart to return deoxygenated blood; arteries & veins tend to be paired