Bio 251 exam 2 newest 2024-
2025 actual exam complete
500 questions and correct
detailed answers (verified
answers) || graded a+
What are the functions of the precorneal tear film?
-ANSWER➖1. Optical uniform surface
2. Lid and globe lubrication
3. Lamellae to decrease evaporation
4. Flush material
5. Prevent dessication and keratinization
6. Limited antimicrobial and nutritional function
How does the cornea respond to oxygen supply in the tear film with the
eyes open versus the eyes closed?-ANSWER➖O2 comes from the
conjunctival blood vessels when the eyes are closed. O2 comes from the
tear film (which has received its supply from the atmosphere) when the
eyes are open. From the tear film is much more efficient.
Discuss glucose levels in the aqueous layer of the tear film.-
ANSWER➖Kept at minimal to prevent bacterial growth in the aqueous.
Most of the glucose in the cornea comes from the aqueous in the anterior
chamber.
Discuss the levels of vitamin A in the aqueous layer of precorneal tear
film.-ANSWER➖Goblet cells need vitamin A as does the process of
epithelial maintenance on the conjunctival surface.
What is the thickness of the tear film based on a Pachymetry map of the
tear film?
-ANSWER➖Normal: 24.7 ± 3.9 microns
Dry: 22.2 ± 4.5 microns
Describe the sources of the lipid layer of the tear film.-
ANSWER➖Mainly the meibomian glands as well as the gland of Zeiss
(associated with hair follicle)
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