Host Parasite Interactions Flashcards
First line of defense against pathogens.
Natural immune defenses (non-specific)
Provides effective surface protection against invasion from parasites.
Intact skin
Filariform larvae of ___ and _____ synthesize protein that aids them to create an entry in the skin
Hookworms and Strongyloides
They are capable of skin penetration because of the presence of the glands that secretes lytic enzymes.
Schistosoma spp. cercariae
It also provides external barriers to parasite entry in the organ.
Mucous membrane lining (respiratory, gastrointestinal, genitourinary tracts)
T or F
High pH of vaginal secretions and gastric juice presents a hostile environment to many microorganisms.
False- low pH
This parasite is unable to survive in an acidic environment of the vagina.
Trichimonas vaginalis
Intestinal secretions envelope ____, its motility is greatly diminished reducing injury the host.
Giardia lamblia
T or F
The adult stages of Helminths that are ingested are protected from the acidic environment.
False- survival stages (ova, eggs, cysts)
What protects the embryonated eggs of Ascaris, Trichuris, and Taenia spp. from an acidic environment?
Thick egg shells
The ____ of Entamoeba and Giardia is also resistant in acid PH in the stomach.
Cystic wall.
What chemical components are toxic in Giardia lamblia found in the breast milk?
Lipase
Found in tears and saliva that enable to destroy microorganisms.
Lysozome
Taside from lysozyme, what components are present in tears and saliva?
IgA
Which human reflexes help to eliminate parasites?
A. blinking
B. Sneezing
C. Coughing
D. Flushing of urine
B, C, D
