Introduction Flashcards Preview

VTEC.3100 > Introduction > Flashcards

Flashcards in Introduction Deck (20):
1

Parasite

Organism that lives ON (external) or IN (internal) and at the expense of another organism (the HOST)

2

Definitive (Final) Host:

The host in which the parasite adults undergo sexual reproduction.

3

Intermediate Host:

Usually the host in which only immature (asexual) stages of the parasite occur.

4

Paratenic (Transport) Host

A potential intermediate host in which there is no development of the immature parasite; the host does not favor nor hinder the parasite in the completion of its life cycle.

5

Reservoir Host:

An infected definitive host (animal) serving as a source from which other animals or man can become infected.

6

Direct transmission

transfer does not require an intermediate host

7

Indirect transmission:

requires an intermediate host in which development occurs

8

parasitism

Type of symbiosis
Host is usually injured to some degree

9

Protozoa: in Kingdom Protista

Single celled organisms – usually microscopic, complex.

10

flagellates

move by flagella(e)

11

Amoebas

move by cytoplasmic protrusions called pseudopodia
(many free living, many parasitic)

12

Sporozoa

All intracellular parasites

13

Ciliates

cell surface covered with rows of cilia

14

Trematoda flatworms – Flukes

Thick oval, leaf shape is most common
All except Schistosoma contain both ovaries and testes

15

Cestoidea – Tapeworms

Most common form is elongated, ribbon-like
Growth of worm begins from segments being budded off anterior end, called scolex
Larval forms called metacestodes develop in intermediate hosts

16

Nematoda

Cylindrical worms, separate sexes
May or may not require intermediate hosts


Have five larval stages

17

Acanthocephala

Thorny proboscis separates them from nematodes

18

Arthropoda types

insecta and arachnida

19

insecta

Insecta: Adults have 6 legs & segmented body

20

arachnida

Adults have 8 legs (nymphs usually have 6 legs)