Intro to parasitology Flashcards Preview

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Flashcards in Intro to parasitology Deck (12)
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1
Q

Definition of parisitology

A

Association b/w two species, smaller is physiologically dependent on host. Parasite has higher reproductive potential than host and potential to harm host.

2
Q

Types of parasites

A

Ecto- (surface) and endoparasite (includes inside GI tract)

3
Q

Types of hosts

A

Intermediate - parasite multiplies asexually (in larva) and definitive - parasite multiplies sexually (in adult)

4
Q

Types of vectors for parasites

A

Vector is an invertebrate which transports parasite. Mechanical and biological

5
Q

Forms of parasites

A

Infective form (environmentally hardy, protected (cyst, egg)) and Invasive form (vulnerable naked cell, responsible for invasion (trophozoite, larva)

6
Q

Single host parasites

A

Transmission determined by environmental viability. Direct (vegetative form) and Indirect (cyst, egg - infective form). Distribution determined by hygiene, sanitation

7
Q

Multiple host parasites

A

Transmission requires more than one host. Distribution determined by second host’s ecological niche.

8
Q

Protozoa

A

Unicellular (nucleus, cytoplasm), Locomotion (pseudopodia, flagella), Multiplication: asexual and sexual (cysts)

9
Q

Helminths

A

Multicellular; specialized, differentiated organs; sexual reproduction (eggs)

10
Q

Immunity to parasitic infections

A

Can be acquired with many diseases, but less immunity to subsequent infections than viruses/bacteria b/c their antigens are so complex and change so much. Absolute immunity rare with protozoa, never with helminths. Stimulate both cell-mediated and humoral.

11
Q

Eosinophilia

A

High eosinophil count. NOT specific to parasites (can be allergies, connective tissue disorders, neoplasms). Produced by helminths and only when tissue invasion), not protozoa.

12
Q

Parasite effect on host

A

Tissue damage, competition for nutrients, use host’s non-nutrient resources (suck blood), mechanical interference, poisons and secretions, abnormal tissue responses.