Mucus lining of the stomach epithelium Secretion of zymogens
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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Hello, I do not understand this. May I get help with this physiology question? Steps leading to the correct answer would be helpful.
Question: Humans are heterotrophs and gain nutrients from eating other organisms (even vegans). As a consequence, many of the proteins that we eat and start to digest are quite similar in composition to our own tissues. A major problem that our gastrointestinal tract therefore faces is how to prevent digestive juices from breaking down our own GI tract's proteins (called "auto-digestion"). When our body's solutions to auto-digestion fail, we develop peptic ulcers. Ouch!
Which of the following is NOT a major example of how our bodies solve the problem of auto-digestion of our GI tract's proteins: (see image)
Transcribed Image Text:**Transcription for Educational Website:**
1. **Mucus lining of the stomach epithelium**
- The inner surface of the stomach is protected by a thick layer of mucus. This mucus lining acts as a barrier preventing the acidic environment from damaging the stomach tissue.
2. **Secretion of zymogens**
- Inactive enzyme precursors, known as zymogens, are secreted by the stomach and pancreas. Once activated, they play a crucial role in digestion.
3. **YES**
- This entry may indicate confirmation or agreement with a process or statement, possibly relating to digestive functions.
4. **Stomach acid stopping the action of salivary amylases**
- The acidic environment of the stomach inactivates salivary amylase, an enzyme that begins carbohydrate digestion in the mouth. This ensures that digestion continues in the intestines under different conditions.
5. **Bicarbonate secretion of pancreas into duodenum**
- The pancreas secretes bicarbonate ions into the duodenum, neutralizing stomach acid entering from the stomach. This creates an optimal pH for enzyme activity in the intestine.
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