CLEARING Flashcards
What is the main purpose of clearing in histology?
A. To stain the tissue
B. To dehydrate the tissue
C. To remove the dehydrating agent and replace it with a solvent
D. To infiltrate the tissue with paraffin
C
Which of the following is NOT a clearing agent?
A. Xylene
B. Glycerin
C. Toluene
D. Chloroform
B
Which of the following acts only as a dealcoholizing agent but not a clearing agent?
A. Glycerin
B. Chloroform
C. Xylene
D. Terpineol
B
Which of the following is used for both clearing in embedding and clearing in mounting?
A. Xylene
B. Chloroform
C. Brun’s solution
D. Carbon Tetrachloride
A
Which clearing agent is recommended for delicate tissues like nervous tissue and lymph nodes?
A. Xylene
B. Benzene
C. Chloroform
D. Cedarwood oi
C CHLOROFORM
Which of the following is NOT suitable for use in clearing before mounting?
A. Xylene
B. Terpineol
C. Carbol-xylene
D. Chloroform
D CHLOROFORM
Which clearing agent can turn milky when dehydration is incomplete?
A. Xylene
B. Benzene
C. Toluene
D. Cedarwood oil
XYLENE
Which of the following causes aplastic anemia upon excessive exposure?
A. Xylene
B. Benzene
C. Chloroform
D. Cedarwood oil
BENZENE
Which clearing agent is commonly used for CNS, smooth muscles, and skin?
A. Xylene
B. Cedarwood oil
C. Chloroform
D. Benzene
CEDARWOOD OIL
Which of the following is used to clear tissues embedded in celloidin?
A. Xylene
B. Benzene
C. Cedarwood oil
D. Terpineol
CEDARWOOD OIL
Which clearing agent is recommended for large specimens and tough tissues?
A. Chloroform
B. Xylene
C. Benzene
D. Cedarwood oil
CHLOROFORM
Which clearing agent can emit toxic fumes when concentrated solutions are used?
A. Xylene
B. Benzene
C. Toluene
D. Chloroform
TOLUENE
What is the typical boiling point’s role in the clearing process?
A. It affects the rate of tissue transparency
B. It determines the solubility of paraffin
C. Low boiling point agents are replaced quickly by paraffin
D. It prevents the tissue from hardening
C. Low boiling point agents are replaced quickly by paraffin
Which clearing agent is most suitable for clearing delicate tissues like embryos and insects?
A. Aniline oil
B. Xylene
C. Benzene
D. Cedarwood oil
ANILINE OIL
Which clearing agent is known to clear slowly and may cause aniline dye removal?
A. Xylene
B. Clove oil
C. Benzene
D. Cedarwood oil
CLOVE OIL
Which agent is a substitute for cedarwood oil and acts slowly due to high viscosity?
A. Terpineol
B. Xylene
C. Benzene
D. Chloroform
TERPINEOL
What should be done to cedarwood oil before use if it has turned milky?
A. It should be heated
B. It should be discarded
C. It should be filtered
D. It should be mixed with xylene
It should be filtered
Which clearing agent is commonly used for routine purposes and doesn’t cause excessive hardening?
A. Toluene
B. Benzene
C. Chloroform
D. Cedarwood oil
TOLUENE
Which of the following is a disadvantage of using benzene as a clearing agent?
A. It is extremely slow
B. It is carcinogenic
C. It turns milky upon storage
D. It is not miscible with paraffin
CARCINOGENIC
Which clearing agent is derived from essential oils and is found in citrus peels?
A. Xylene
B. Terpenes
C. Cedarwood oil
D. Aniline oil
TERPENES
Which clearing agent can cause tissues to float, requiring the use of absorbent cotton gauze?
A. Xylene
B. Chloroform
C. Benzene
D. Cedarwood oil
CHLOROFORM
Which clearing agent is known to cause slow penetration due to high viscosity?
A. Xylene
B. Benzene
C. Cedarwood oil
D. Toluene
BENZENE
Which clearing agent can be used in both embedding and mounting procedures but is slower than xylene and benzene?
a) Toluene
b) Chloroform
c) Cedarwood oil
d) Xylene
TOLUENE
Which clearing agent must be followed by immersion in xylene or benzene to remove oil from tissues?
a) Chloroform
b) Toluene
c) Cedarwood oil
d) Benzene
CEDARWOOD OIL
Which clearing agent is known for being toxic to the liver on prolonged inhalation?
a) Benzene
b) Xylene
c) Chloroform
d) Toluene
CHLOROFORM
Which clearing agent turns milky if dehydration is not complete and is used in both embedding and mounting?
a) Xylene
b) Toluene
c) Benzene
d) Cedarwood oil
XYLENE
