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Chapter 27 biology.!
| Question | Answer |
|---|---|
| what are flatworms? | soft, flattened worms that have tissues and internal organ system |
| what are 3 characteristics of flatworms? | 3 embryonic germ layers, bilateral symmetry, cephalization |
| acoelomates: | without coelom |
| coelom: | fluid-filled body cavity that is lined with tissue derived from mesoderm |
| Flatworms DO/DONOT have coeloms? | Do not -- acoelomates |
| pharnyx: | muscular tube that pumps food into the digestive cavity |
| do flatworms have a pharynx? | yes |
| flame cells: | specialized cells that remove excess water from the body |
| do flatworms have flame cells? | yes |
| ganglia: | groups of nervous cells |
| eyespot: | group of cells that can detect changes in the amount of light in their environment |
| how do flatworms move? | cilia or muscle cells |
| hermaphrodite: | individual that has both male and female reproductive organs |
| flatworms reproduce _____ | sexually |
| fission: | an organism splits in two, each half grows new parts |
| what are the groups of flatworms? | turbellarians, flukes, tapeworms |
| where do most turbellarians live? | fresh water |
| what is an example of a turbellarian? | planarian |
| what are flukes? | parasitic flatworms that infect the internal organs of their host |
| what is the schistosoma mansoni blood fluke? | infects humans by burrowing through the skin in water and infects the intestine, causes schistosomiasis |
| what are tapeworms? | long, flat, parasitic worms that are adapted to life inside the intestines of their host |
| scolex: | head of an adult tapeworm that contains suckers or hooks |
| proglottids: | segments that make up the tapeworm's body |
| testes: | male reproductive organs |
| what are roundworms? | slender, unsegmented worms with tapering ends |
| how are flatworms and roundworms different? | roundworms hae a body cavity between the endoderm and mesoderm tissues; digestive tract with two openings |
| psuedocoelom: | false coelom |
| what is the roundworms digestive system? | tube-within-a-tube; two openings |
| what are the parasitic roundworms? | trichinosis causing worms. filarial worms, ascarid worms, hookworms |
| how are filarial worms transmitted? | transmitted from one host to another through mosquitoes |
| what is and annelid? | worm with segmented bodies, have a true coelom that is lined with tissue derived from mesoderm |
| crop: | store of food |
| gizzard: | grinds food into smaller pieces |
| annelids hava a closed circulatory system: | blood is contained within blood vessels |
| how to annnelids breathe? | gills |
| nephridia: | excretory organs that filter fluid in the coelom |
| what are oligochaetes? | annelids that typically have steam-lined bodies and relatively few setae compared to polychaetes; live in soil or freshwater |
| what are mullusks? | soft-bodied animals that usually have an internal or external shell |
| what are the groups of mullusks? | gastropods, bivalves, and cephalopods |
| what are gastropods? | shell-less or single-shelled mollusks that move by using a muscular foot located on the ventral side |
| what is a bivalve? | two shells held together by one or two muscles |
| what are cephalopods? | soft-bodied mollusks in which the head is attached to a single foot |
| what are examples of mullusks? | squid, octupi, snails |
Created by:
jena_leigh
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