Multiple Choice
Which of the following statements about digestion is true?
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23. The Digestive System
Introduction to the Digestive System
Multiple Choice
In which part of the gastrointestinal tract are acidophiles most likely to be found?
A
Small intestine
B
Esophagus
C
Stomach
D
Large intestine
Verified step by step guidance1
Understand the term 'acidophiles': Acidophiles are organisms that thrive in acidic environments, typically with a pH below 5. They are adapted to survive and grow in conditions that would be hostile to most other organisms.
Identify the pH levels of different parts of the gastrointestinal tract: The stomach is known for its highly acidic environment, with a pH ranging from 1.5 to 3.5 due to the secretion of hydrochloric acid. This makes it the most acidic part of the gastrointestinal tract.
Compare the pH levels: The small intestine has a more neutral to slightly alkaline pH, typically around 6 to 7.5, due to the presence of bicarbonate ions. The esophagus generally has a neutral pH, close to 7, as it is primarily a conduit for food. The large intestine has a slightly acidic to neutral pH, around 5.5 to 7, due to bacterial fermentation.
Determine the environment suitable for acidophiles: Given the pH levels, acidophiles are most likely to be found in the stomach, where the acidic conditions are ideal for their growth and survival.
Conclude the reasoning: Based on the understanding of pH levels and the definition of acidophiles, the stomach is the correct answer as it provides the necessary acidic environment for acidophiles to thrive.
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