Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- Back
|
The saliva is a mixture of the secretions of the 3 pairs of salivary glands -- __, __, __ and numerous small buccal glands. It is a colorless, slightly viscid, opalescent fluid. The composition varies with the relative proportion of the secretions of the different glands. The secretion of the __ is more watery and rich in ptyalin, while those of the __ and __ are more viscid, containing more of __, a __, and poorer in ptyalin.
|
parotid
submaxillary sublingual parotid submaxillary sublingual mucin glycoprotein |
|
|
What is ptyalin?
|
enzyme in saliva that converts starch Ino Dextrin and Maltose
|
|
|
Objectives:
1. To determine the composition of saliva 2. To determine the function of saliva in the digestive process |
-
|
|
|
Test reaction of saliva with following:
a. Resting saliva + phenolphthalein b. Resting saliva + red litmus c. Resting saliva + blue litmus d. Resting saliva + congo red |
a. no change
b. blue c. no change d. no change |
|
|
What is phenolphthalein and congo red?
|
Phenolphthalein:
used as indicator in acid-base titration and as laxative congo red: used as a dye, biological stain, and chemical indicator; if not acid fast or lightfast |
|
|
Based on the color reactions of the acid-base indicators used above, is the saliva sample acidic or basic?
|
Resting saliva is basic
|
|
|
Perform same test with STIMULATED saliva
a. Stimulated saliva + phenolphthalein b. Stimulated saliva + red litmus c. Stimulated saliva + blue litmus d. Stimulated saliva + congo red |
a. no change
b. blue c. no change d. no change |
|
|
Based on color reactions of the acid-base indicators used above, is the saliva sample acidic or basic?
|
Stimulated saliva is basic
|
|
|
What are the inorganic constituents of saliva?
|
chloride
sulfur phosphate calcium |
|
|
Write the chemical formula for the following:
chloride sulfur phosphate calcium |
see photo
|
|
|
Test for nitrites:
Add 2 drops of KI solution and 2 drops of starch paste. Result? |
light blue
|
|
|
Viscosity Test
One tube place 10 ml saliva; the other 10 mL water. Note which sol. filters faster |
water and starch paste sol.
|
|
|
In conclusion, saliva is a mixture of the secretions of the 3 pairs of salivary glands -- parotid, submaxillary, sublingual and numerous small buccal glands. The composition and the viscosity varies with the relative proportion of the secretions of the different glands in the following tests. We can detect that saliva is __ wether resting or stimulated saliva (red litmus turns to blue and no reaction on phenolphthalein, blue litmus, and congo red). Saliva is also more __ than water. Furthermore, saliva tested __ for nitrites, but positive for the presence of __, __, __, and __
|
basic
viscous negative chlorides phosphates sulfates calcium |
