BIO 269 QUESTIONS AND ANSWERS LATEST UPDATE 100%
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What is secretion?
release of water, acid, buffers, and enzymes into lumen of GI tract
Gastric (stomach) secretions pH =
1.0-3.5 (very acidic)
Total volume of secretions (on average) in the human body (daily) =
6.7 or about 7 liters
What are the three major saliva glands?
Parotoid, submandibular, sublingual
Secretions primarily are controlled by ...
the parasympathetic influence
Secretions are composed of ...
99.5% water, 0.5% proteins and electrolytes
The proteins in secretions contain:
amylase, lingual lipase, mucin, and lysozyme
What is the function of water in terms of secretion?
softens food
What is the function of amylase in terms of secretion?
polysaccharide breakdown
What is the function of lingual lipase in terms of secretion?
fat breakdown
What is the function of mucin in terms of secretion?
lubrication; combines with water to make mucus
What is the function of lysozome in terms of secretion?
kills bacteria
Esophageal secretion contains what?
mucus
What does mucus do in the esophagus? (during esophageal secretion)
- as food moves through esophagus, compresses mucus- secreting esophageal glands
- provides lubrication for swallowing and helps food passage
- transit time for food to stomach is about 8-10 seconds
What are the three phases of digestion?
1. Cephalic
2. Gastric
3. Intestinal
When does the cephalic phase occur?
it happens before the food enters the stomach
What is the cephalic phase triggered by?
Triggered by the aroma, taste, sight, and thought of food stimulate secretory activity -->
ex. mouth watering at the thought of food
When does the gastric phase occur?
When the food reaches the stomach/events that happen in the stomach
What stimulates the gastic phase?
CORRECT A+ GRADED. Buy Quality Materials!
What is secretion?
release of water, acid, buffers, and enzymes into lumen of GI tract
Gastric (stomach) secretions pH =
1.0-3.5 (very acidic)
Total volume of secretions (on average) in the human body (daily) =
6.7 or about 7 liters
What are the three major saliva glands?
Parotoid, submandibular, sublingual
Secretions primarily are controlled by ...
the parasympathetic influence
Secretions are composed of ...
99.5% water, 0.5% proteins and electrolytes
The proteins in secretions contain:
amylase, lingual lipase, mucin, and lysozyme
What is the function of water in terms of secretion?
softens food
What is the function of amylase in terms of secretion?
polysaccharide breakdown
What is the function of lingual lipase in terms of secretion?
fat breakdown
What is the function of mucin in terms of secretion?
lubrication; combines with water to make mucus
What is the function of lysozome in terms of secretion?
kills bacteria
Esophageal secretion contains what?
mucus
What does mucus do in the esophagus? (during esophageal secretion)
- as food moves through esophagus, compresses mucus- secreting esophageal glands
- provides lubrication for swallowing and helps food passage
- transit time for food to stomach is about 8-10 seconds
What are the three phases of digestion?
1. Cephalic
2. Gastric
3. Intestinal
When does the cephalic phase occur?
it happens before the food enters the stomach
What is the cephalic phase triggered by?
Triggered by the aroma, taste, sight, and thought of food stimulate secretory activity -->
ex. mouth watering at the thought of food
When does the gastric phase occur?
When the food reaches the stomach/events that happen in the stomach
What stimulates the gastic phase?
