Apicomplexans Flashcards
1
Q
general characteristics
A
- cyst or sporelike structures
- apical complex
- parasitic
- no cilia or flagella
- asexual or sexual reproduction
2
Q
apical complex
A
- conoid, polar ring, micronemes, subpellicular microtubules
- proteins that help parasite get into host cell
- rhoptries aid in adhesion and formation of vacuole
3
Q
Apicomplexa Main Stages of Reproduction
A
schizogony/merogony = replication in high numbers
gametogony = making gametes –> zygotes –> oocyst
sporogony = sporulation of oocysts, become infectious
4
Q
Hepatozoans
A
- blood feeding arthropod definitive host
- transmission through consumption
- Hepatozoan Americanum
5
Q
Hepatozoan americanum
A
- dogs in southern US
- asexual stage (merogony) in skeletal muscle
- ticks are DH
- gametogenesis in gut of tick –> oocyst
- dog infected after eating tick –> sporocysts
6
Q
Emeriidae
A
- merogony and gametogony occur in host
- sporogony outside
- micropele = tiny opening covered by micropylar cap
- SPECIES SPECIFIC eg. coccidia in GI tract of dogs
- some self-limiting, host may develop partial immunity
- Eimeria tenella
7
Q
Structure of Oocyst
A
oocyst –> sporocysts –> sporozoites
8
Q
Eimeria tenella
A
- ceca of chickens, high mortality in young birds
- destroys tissues, enters epithelial cells
- have both macrogametes and microgametes (dinecious)
9
Q
Toxoplasma gondii
A
- cats only definitive host (in intestine)
- acute infection = tachyzoites
- chronic infection = bradyzoites, immune system dampens
- zoitocyst stage surrounded by tough wall, survives for years
- dinecious w few males
10
Q
Sarcocystis
A
- tissue cysts in muscle and brain tissue in reptiles and birds
- heteroxenous life cycle (carnivorous DH, herbivore IH)
- through undercooked meat
- sporulation inside body
11
Q
Besnoitia
A
- chronic = skin problems and infertility in bulls
- actue = swelling, fever
- cats definitive host
12
Q
Haemoproteus
A
- blood cells infected with merozoites (from cells in lungs)
- flies = definitive host
- affects birds
- Haemoproteus columbae
13
Q
- cyst or sporelike structures
- apical complex
- parasitic
- no cilia or flagella
- asexual or sexual reproduction
A
general characteristics
14
Q
- conoid, polar ring, micronemes, subpellicular microtubules
- proteins that help parasite get into host cell
- rhoptries aid in adhesion and formation of vacuole
A
apical complex
15
Q
schizogony/merogony = replication in high numbers
gametogony = making gametes –> zygotes –> oocyst
sporogony = sporulation of oocysts, become infectious
A
Apicomplexa Main Stages of Reproduction
