Clinical Applicatic Pancreatin is an extract of pancreatic secretions. It inclodes pancreatic amylase, lipase, and proteolytic (protein-digesting) enzymes, Wearers of contact lenses sometimes use pancre- atin solutions, marketed as "enzyme cleaners," to clean their lenses. Contact lenses float on the tear fluid over the cormea. Over time, components of tear fluid build up on contact lenses. Tear fluid tends to form three layers, as shown in figure 34.4. The top layer is mostly lipids from skin oil (sebum) and other sources. The middle layer is an aqueous solution of salts, proteins, and other substances. The bottom layer is mainly composed of mucin, which in turn is composed of combined polysaccharide-protein molecules called glycoproteins. With this background and what you already know about enzymes and digestion, answer the following application questions. Figure 34.4 1. On which components of the tear fluid can pancreatin act? On what do ye

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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nis International Student Edition is for use outside of the U.S.
34-4
Clinical Application
Pancreatin is an extract of pancreatic secretions. It includes
pancreatic amylase, lipase, and proteolytic (protein-digesting)
enzymes, Wearers of contact lenses sometimes use pancre-
atin solutions, marketed as "enzyme cleaners," to clean their
lenses.
Contact lenses float on the tear fluid over the cornea. Over
time, components of tear fluid build up on contact lenses.
Tear fluid tends to form three layers, as shown in figure 34.4.
The top layer is mostly lipids from skin oil (sebum) and other
sources. The middle layer is an aqueous solution of salts,
proteins, and other substances. The bottom layer is mainly
composed of mucin, which in turn is composed of combined
polysaccharide-protein molecules called glycoproteins.
Lipids
Dissolved proteins
Polysaccharides
proteins
With this background and what you already know about
enzymes and digestion, answer the following application
questions.
Conjunctiva
(covering of eye)
Figure 34.4 The three layers of tear fluid on the eye.
1. On which components of the tear fluid can pancreatin act? On what do you base your answer?
2. How would the digestion of tear fluid components help a wearer of contact len
s?
3. At what temperature would you recommend using enzymatic contact lens cleaning solutions? Explain.
4. Manufacturers of enzymatic contact lens cleaners recommend that the lenses be soaked in a nonenzyme solution for 31
least 4 hours after cleaning before wearing them again. What could happen if enzyme remained on a lens when put bac
on an eye?
Transcribed Image Text:nis International Student Edition is for use outside of the U.S. 34-4 Clinical Application Pancreatin is an extract of pancreatic secretions. It includes pancreatic amylase, lipase, and proteolytic (protein-digesting) enzymes, Wearers of contact lenses sometimes use pancre- atin solutions, marketed as "enzyme cleaners," to clean their lenses. Contact lenses float on the tear fluid over the cornea. Over time, components of tear fluid build up on contact lenses. Tear fluid tends to form three layers, as shown in figure 34.4. The top layer is mostly lipids from skin oil (sebum) and other sources. The middle layer is an aqueous solution of salts, proteins, and other substances. The bottom layer is mainly composed of mucin, which in turn is composed of combined polysaccharide-protein molecules called glycoproteins. Lipids Dissolved proteins Polysaccharides proteins With this background and what you already know about enzymes and digestion, answer the following application questions. Conjunctiva (covering of eye) Figure 34.4 The three layers of tear fluid on the eye. 1. On which components of the tear fluid can pancreatin act? On what do you base your answer? 2. How would the digestion of tear fluid components help a wearer of contact len s? 3. At what temperature would you recommend using enzymatic contact lens cleaning solutions? Explain. 4. Manufacturers of enzymatic contact lens cleaners recommend that the lenses be soaked in a nonenzyme solution for 31 least 4 hours after cleaning before wearing them again. What could happen if enzyme remained on a lens when put bac on an eye?
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