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Questions and Answers
Helminths are unicellular organisms equipped with organs and organ systems.
Helminths are unicellular organisms equipped with organs and organ systems.
False (B)
Platyhelminthes are commonly known as roundworms.
Platyhelminthes are commonly known as roundworms.
False (B)
Nematodes, also known as roundworms, have elongated, cylindrical, and unsegmented bodies.
Nematodes, also known as roundworms, have elongated, cylindrical, and unsegmented bodies.
True (A)
The helminth life cycle only includes the larval and adult stages.
The helminth life cycle only includes the larval and adult stages.
Adult helminths reproduce asexually within a host's body.
Adult helminths reproduce asexually within a host's body.
Trematodes exclusively exhibit separate sexes and distinct appearances.
Trematodes exclusively exhibit separate sexes and distinct appearances.
Cestodes typically have a hermaphroditic reproductive system.
Cestodes typically have a hermaphroditic reproductive system.
Ascariasis is transmitted through fly bites.
Ascariasis is transmitted through fly bites.
Dracunculus medinensis is transmitted through consumption of water containing Cyclops.
Dracunculus medinensis is transmitted through consumption of water containing Cyclops.
Schistosoma japonicum is transmitted via consumption of undercooked or raw fish.
Schistosoma japonicum is transmitted via consumption of undercooked or raw fish.
Flashcards
Helminths
Helminths
Multicellular animals, free in soil and water, equipped with organs and organ systems.
Platyhelminthes
Platyhelminthes
Flatworms, very thin, often segmented body plan, and divided into cestodes (tapeworms) and trematodes (flukes).
Nematodes
Nematodes
Roundworms that are elongated, cylindrical, unsegmented body.
Helminth Life Cycle
Helminth Life Cycle
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Nematode Reproduction
Nematode Reproduction
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Trematode Reproduction
Trematode Reproduction
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Cestode Reproduction
Cestode Reproduction
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Ascariasis
Ascariasis
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Pinworm
Pinworm
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Trichina Worm
Trichina Worm
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Study Notes
- Helminths are free in soil and water
Helminth Characteristics
- Multicellular animals with organs and organ systems
- Platyhelminthes are flatworms
- Nematodes are roundworms
- Microscopic eggs and larvae
Flatworms
- Flatworms are in the phylum Platyhelminthes
- They are very thin
- Often have a segmented body plan
- Divided into cestodes (tapeworms) and trematodes (flukes)
Roundworms
- Roundworms are in the phylum Aschelminthes
- Roundworms are also called nematodes
- Elongated, cylindrical, unsegmented body
Helminth Life Cycle
- Complete life cycle includes the fertilized egg, larval, and adult stages
- Adults derive nutrients and reproduce sexually in a host's body
- The pinworm (Enterobius vermicularis) is an example of a helminth
Helminth Reproduction
- Nematodes: sexes are separate and different in appearance
- Trematodes: sexes can be separate or hermaphroditic
- Cestodes: generally hermaphroditic
Examples and Transmission
- Roundworms Nematodes are intestinal
- Ascaris lumbricoides causes ascariasis in humans via fecal pollution containing eggs
- Enterobius vermicularis causes pinworm in humans through close contact
- Trichinella spiralis causes trichina worm in pigs and wild mammals through consumption of meat containing larvae
- Tissue Nematodes
- Onchocerca volvulus causes river blindness in humans via black flies
- Dracunculus medinensis causes guinea worm in humans from water containing Cyclops
- Flatworms-Trematodes
- Schistosoma japonicum causes blood fluke in humans and snails via skin penetration of larva
- Flatworms-Cestodes
- Taenia solium causes pork tapeworm in humans and swine from consumption of undercooked or raw pork
- Diphyllobothrium latum causes fish tapeworm in humans and fish from consumption of undercooked or raw fish
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