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Parasitology with Angela Swan at Bel-Rea


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Lou Hahn


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Indirect lifecycle
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A life cycle that MUST make USE of an INTERMEDIATE Host

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Parasitology with Angela Swan at Bel-Rea - Details

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111 questions
🇬🇧🇬🇧
Indirect lifecycle
A life cycle that MUST make USE of an INTERMEDIATE Host
Indirect lifecycle
A life cycle that MUST make USE of an INTERMEDIATE Host
Indirect lifecycle
A life cycle that MUST make USE of an INTERMEDIATE Host
Indirect lifecycle
A life cycle that MUST make USE of an INTERMEDIATE Host
Indirect lifecycle
A life cycle that MUST make USE of an INTERMEDIATE Host
Indirect lifecycle
A life cycle that MUST make USE of an INTERMEDIATE Host
Indirect lifecycle
A life cycle that MUST make USE of an INTERMEDIATE Host
Indirect lifecycle
A life cycle that MUST make USE of an INTERMEDIATE Host
3 factors of expense
1)Age/health of patient 2)Number of parasites 3)Kind/injury
Ectoparasite
External parasite
Endoparasite
Internal parasite
Where can endoparasites be?
1.Most are in GI, mouth, esophagus, sm/lg intestine.
Stationary parasite
A parasite that attaches somewhere and stays there.
Periodic parasite
A parasite that stays on/off the host during part of its lifecycle
Permanent Parasite
A parasite that stays on host all the time
Obligate Parasite
Must live as a parasite.
Facultative
Involves 2 generations of parasites
HOST
A general term used to refer to the animal a parasite lives on or in at any given time
Aberrant parasite
An ectopic parasite
Pseudo parasite
Something that looks like a parasite but isn't.
Final or definitive
Harbors adult stage-every parasite MUST HAVE DEFINITIVE/FINAL Host.
Transport or Paratenic
An unnecessary, but convenient animal that harbors carval stage of a parasite(unnecessary for completion of it's lifecycle
Intermediate
Animal that harbors a larval stage & is necessary to the parasite in completion of it's lifecycle.
Host specific
All Parasites are in this, but can be divided into: Singular: only one animal will harbor adult stage Plural more than one animal can harbor adult stage
Direct lifecycle
Parasite does not need the use of an intermediate host-but can use a paratenic. DOES NOT USE INTERMEDIATE
Indirect lifecycle
A life cycle that MUST make USE of an INTERMEDIATE Host
Typical lifecycle of a parasite or protozoa
Egg/Ova---note: protozoans produce cysts NOT eggs Larva--All parasites have at least one larval stage Adult---The stage that cause an infestation
Infestation
Establishment of a parasite within or upon host Understand that final host "harbors" the adult stage
Routes of infestation
How the parasite enters the host. This is at the point the parasite has reached the "infective stage" Can be either the egg/ova cyst or larva
Prepatent period(PPP)
Time it takes for parasite to become reproductivity mature
Egg or Ova
The first growth stage of a parasite
What is the difference between eggs/ova or cysts?
1.Size of egg usually larger than that of a cyst. 2.Cysts have a thinner wall, while ova are thicker 3.Cysts tend to be filled with fluid therefore more fragile 4.Ova filled with cyto plasm, nucleus, etc(extra)
Larva
The growth stage following the egg or ova stage. A microscopic "baby worm" Larval stage
Operculum
Operculum and indentation of protrusion on one or both ends oval shaped eggs/ova
Public Health Significance (PHS)
Damage a parasite has the potential of doing to the public (only what to do to PEOPLE)
Pathology/ Pathogenicity
The damage that a parasite is capable of producing to it's host.
Morphology
Study of shape
Motility
Movement
Coprophagy
Ingestion of feces
Reproduction
Sex organs 1.Hermaphroditic 2.Monecious 3.Dioecious
Hermaphroditic
Contains both sex organs But neither being functional
Monecious
Contains both sex organs and both are functional (1 to tango)
Dioecious
Containing individual sex organs (ovaries or testes) and ARE functional (2 to tango)
Reproductive categories
Give birth to: Oviparous Ovoviviparous viviparous
Oviparous
Production of ova within the parasite, which pass out of the parasite & into the host, then out of the host as OVA- most common
Ovoviviparous
Production of ova within the parasite that pass into the host as ova, then hatch into larvae and pass out of the host as Larvae
Viva parous
Production of an ova within the parasite which hatch into larvae within parasite, pass into the host and the out of host as larvae (larviparous)
Parasitiasis
Parasite on host and is potentially pathogenic, but animals exhibits no outward signs
Harm by Parasites/Protozoans
1. Absorbing food intended for the host 2. Sucking blood or lymph a. ticks 3. Feeding on the tissue of the host 4. Causing mechanical obstruction or pressure 5. Causing growth of nodules or tumors and preparing tissues or vessels 6. Causing wounds thru which infestation can occur 7. Destruction of tissue 8. Irritation 9. Transmitting some infections d2's such as malaria, viruses, blood protozoa,etc 10.Secreting toxins or otherwise harmful substances such as digestive enzymes, etc 11. Death
What 3 slides may be set up for a routine fecal?
Direct smear, flotation, cytology
List the stain used for the fecal cytology, name of each jar, and procedure for each jar.
1 fixative, 5 1sec dips. 2 eosinophilic, 5 1 sec dips. basophilic, 7-10 1sec dips
List 3 ways a parasite gets its name
Last name of discoverer, geographic location, morphology, final host, anatomical location, intermediate host, pathology
What is the proper order of Taxonomy? which is written in lower case
Kingdom, Phylum, Class, Order, Family, Genus and species
List five larval stages of flukes from youngest to oldest.
Mircidium, Sporocyst, Rediae, Cercariae, Metacercariae
What is the purpose of Lugol's Iodine?
To better visualize Giardia