LE 2 - Blood Nematode and Cestodes (LAB) Flashcards
Identify the Microfilaria
A. WUCHERERIA BANCROFTI
B. BRUGIA MALAYI
C. LOA LOA
D. ONCHOCERCA VOLVULUS
E. MANSONELLA PERSTANS
A. WUCHERERIA BANCROFTI
Bancroftian filariasis
What type of organism is Wuchereria bancrofti?
A) Bacteria
B) Virus
C) Microfilaria
D) Fungus
C) Microfilaria
How would you describe the appearance of adult Wuchereria bancrofti worms?
A) Bulky and segmented
B) Threadlike
C) Spiral-shaped
D) Oval with legs
B) Threadlike
Are the microfilariae of Wuchereria bancrofti sheathed?
A) No
B) Yes
B) Yes
How is the body of Wuchereria bancrofti’s microfilariae shaped?
A) Straight
B) Spiral
C) Gently curved
D) Zig-zag
C) Gently curved
How does the tail of Wuchereria bancrofti’s microfilariae appear?
A) Blunt
B) Tapered to a point
C) Forked
D) Feathered
B) Tapered to a point
Do the microfilariae of Wuchereria bancrofti exhibit terminal nuclei?
A) Yes
B) No
B) No
Which organism does the fresh specimen of Wuchereria bancrofti’s microfilariae resemble?
A) Tiny worms
B) Minute snake-like organisms
C) Small fish
D) Microscopic spiders
B) Minute snake-like organisms
Which of the following is NOT a characteristic of Wuchereria bancrofti’s microfilariae?
A) Sheathed
B) Gently curved body
C) Exhibit terminal nuclei
D) Tail tapered to a point
C) Exhibit terminal nuclei
Wuchereria bancrofti primarily affects which part of the human body?
A) Brain
B) Lungs
C) Lymphatic system
D) Digestive system
C) Lymphatic system
Identify the Microfilaria
A. WUCHERERIA BANCROFTI
B. BRUGIA MALAYI
C. LOA LOA
D. ONCHOCERCA VOLVULUS
E. MANSONELLA PERSTANS
B. BRUGIA MALAYI
Malayan Filariasis
What is a distinctive feature of the microfilariae of Brugia malayi?
a) They are unsheathed.
b) They have 5 terminal nuclei.
c) They are sheathed.
d) They have multiple tails.
c) They are sheathed.
How many terminal nuclei do the microfilariae of Brugia malayi have?
a) 1
b) 2
c) 3
d) 4
b) 2
How are the terminal nuclei of Brugia malayi’s microfilariae in relation to the other nuclei in the tail?
a) Merged with other nuclei.
b) Distinctly separated from the other nuclei.
c) Positioned at the very tip of the tail.
d) They are larger than the other nuclei.
b) Distinctly separated from the other nuclei.
Which of the following best describes the coiling of Brugia malayi species?
a) Loosely coiled.
b) Semi-coiled.
c) Tightly coiled.
d) Not coiled at all.
c) Tightly coiled.
Which of the following worms is smaller in size when compared to Brugia malayi?
a) Ascaris lumbricoides
b) W. bancrofti
c) Taenia solium
d) Enterobius vermicularis
b) W. bancrofti
Identify the Helminth Larvae:
A. Trichinella spiralis (Trichina worm)
B. Taenia solium (Pork tapeworm)
C. Taenia saginata (Beef tapeworm)
D. Hymenolepis nana (Dwarf tapeworm)
E. Hymenolepis diminuta (Rat tapeworm)
A. Trichinella spiralis (Trichina worm)
What is the infective stage of Trichinella spirallis?
a) Adult worm
b) Egg
c) Encysted Larva
d) Free-swimming larva
c) Encysted Larva
Rationale: The encysted larva is the stage that infects a new host when ingested through contaminated meat.
Where do the larvae of Trichinella spirallis become encysted?
a) Liver
b) Lungs
c) Striated muscle fiber
d) Intestine
c) Striated muscle fiber
Rationale: The larvae encyst in striated muscle fibers, forming nurse cells.
Trichinella spirallis: What is the size of the encysted larva?
a) 2 mm in length
b) 1 mm in length
c) 3 mm in length
d) 0.5 mm in length
b) 1 mm in length
Rationale: The encysted larva measures 1 mm in length and 36 um in diameter.
Trichinella spirallis: Which environment do the larvae prefer for development?
a) Rich in glycogen
b) Oxygen-rich
c) Poor in glycogen and hypoxic
d) High in glucose
c) Poor in glycogen and hypoxic
Rationale: The larvae prefer to develop in muscles that are poor in glycogen and have a hypoxic environment.
Trichinella spirallis: How long does it take for the larvae to become encysted after entering the muscle cells?
a) 10 days
b) 20 days
c) 30 days
d) 40 days
b) 20 days
Rationale: Within 20 days after entering the muscle cells, the larvae become encysted.
What is the name given to a muscle cell carrying a larva of T. spirallis?
a) Cyst cell
b) Nurse cell
c) Host cell
d) Larval cell
b) Nurse cell
Rationale: A muscle cell carrying a larva of T. spirallis is referred to as a nurse cell.
Trichinella spirallis: How long can the encysted larva survive?
a) Days
b) Weeks
c) Months to years
d) Hours
c) Months to years
Rationale: The encysted larva can survive for months to years in the host.