CHAPTER 21: GASTROINTESTINAL
SYSTEM
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📋 DOCUMENT OVERVIEW 62 Qs
This document covers the gastrointestinal system, specifically focusing on its functions, organ
responsibilities, digestive processes, and treatment options for related conditions. It provides a
comprehensive review of the subject, including 62 questions with correct answers and detailed
explanations, allowing students to study, review, and gain a deeper understanding of gastrointestinal
system concepts. By leveraging this resource, students can solidify their knowledge and prepare for
exams with confidence.
✓ Verified Answers ✓ Exam Ready ✓ Study Guide
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EXAM QUESTIONS
QUESTION 1
What are the three main functions of the GI system?
CORRECT ANSWER
1. digestion
2. absorption
3. metabolism
RATIONALE: The GI system's primary function is to break down the food we consume into nutrients that the body can
utilize, making digestion the first crucial step. Following digestion, the body absorbs these nutrients through the walls of
the digestive tract, and then it uses them to produce energy and sustain life through the process of metabolism, which
encompasses both energy conversion and cellular processes.
QUESTION 2
What system controls the GI system?
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, CORRECT ANSWER
the parasympathetic nervous system
RATIONALE: The parasympathetic nervous system plays a crucial role in regulating various bodily functions, including
digestion, by stimulating the release of digestive enzymes and increasing gut motility, thus controlling the GI system.
This is achieved through its nerve fibers that release acetylcholine, a neurotransmitter that stimulates the contraction of
smooth muscle in the GI tract and promotes the digestive process.
QUESTION 3
What are the four organs of the GI system that are responsible for ingestion?
CORRECT ANSWER
mouth, salivary glands, pharynx, and esophagus
RATIONALE: The correct answer is based on the definition of ingestion, which is the process of taking food into the
body, and the specific roles of each organ in this process. The mouth, salivary glands, pharynx, and esophagus work
together to break down food, mix it with saliva, and transport it from the mouth to the stomach, marking the end of the
ingestion process in the GI system.
QUESTION 4
What three organs are responsible for absorption of nutrients?
CORRECT ANSWER
stomach, small intestine, and large intestine
RATIONALE: The stomach, small intestine, and large intestine are primarily responsible for absorption of nutrients
because the stomach breaks down food into smaller molecules, the small intestine further digests and absorbs most of
the nutrients into the bloodstream, and the large intestine absorbs water and electrolytes while also storing and
eliminating waste. This sequence of nutrient processing and absorption occurs in these organs due to their unique
structures and functions, with the small intestine's large surface area allowing for efficient nutrient uptake.
QUESTION 5
The mouth is where food is broken down. What enzyme helps in the chemical breakdown that is
secreted by the salivary glands?
CORRECT ANSWER
amylase
RATIONALE: Amylase is the correct enzyme because it specifically breaks down carbohydrates, such as starches, found
in food into simpler sugars, which is essential for further digestion. The salivary glands secrete amylase into the mouth
to initiate the chemical breakdown of food during the initial stages of digestion.
QUESTION 6
The function of the epiglottis is to:
a. Break down food particles
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, b. Digest food
c. Block off the tracheal tube
d. Aid in peristalsis
CORRECT ANSWER
c
RATIONALE: The epiglottis plays a crucial role in preventing food and liquids from entering the trachea, which is a
critical function in maintaining respiratory health. By positioning itself over the tracheal tube during swallowing, the
epiglottis effectively blocks off the tracheal tube, thereby ensuring that food and liquids follow the correct path through
the esophagus and into the digestive system.
QUESTION 7
THe esophagus performs ____ to propel food.
CORRECT ANSWER
peristalsis
RATIONALE: Peristalsis is the correct answer because it is a wave-like muscular contraction that helps to move food
through the digestive system, including the esophagus, by sequentially constricting and relaxing muscles to propel the
food forward. This process is essential for the esophagus to effectively transport food from the mouth to the stomach,
allowing for proper digestion and preventing food from entering the lungs.
QUESTION 8
What is the pH of the stomach?
CORRECT ANSWER
pH= 2
RATIONALE: The stomach's environment is highly acidic due to the presence of hydrochloric acid (HCl), which
dissociates into hydrogen ions (H+) and chloride ions (Cl-), increasing the concentration of hydrogen ions in the
stomach. This high concentration of hydrogen ions results in a low pH value, specifically around 2, which is
characteristic of the stomach's acidic environment.
QUESTION 9
After the breakdown in the stomach, the acidic mixtures becomes ____.
CORRECT ANSWER
chyme
RATIONALE: The acidic mixture in the stomach breaks down food into a liquid semifluid substance through a process
called digestion, where enzymes and acids chemically alter the food's composition. This transformed mixture is then
referred to as chyme, which can pass through the pyloric sphincter and into the small intestine for further nutrient
absorption.
QUESTION 10
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SYSTEM
60+ (Premium 2026) Exam Training Kit | 100% Verified Answers | A+
Success Rate
100% Guarantee Pass
📋 DOCUMENT OVERVIEW 62 Qs
This document covers the gastrointestinal system, specifically focusing on its functions, organ
responsibilities, digestive processes, and treatment options for related conditions. It provides a
comprehensive review of the subject, including 62 questions with correct answers and detailed
explanations, allowing students to study, review, and gain a deeper understanding of gastrointestinal
system concepts. By leveraging this resource, students can solidify their knowledge and prepare for
exams with confidence.
✓ Verified Answers ✓ Exam Ready ✓ Study Guide
Trusted by thousands of students and professionals worldwide
EXAM QUESTIONS
QUESTION 1
What are the three main functions of the GI system?
CORRECT ANSWER
1. digestion
2. absorption
3. metabolism
RATIONALE: The GI system's primary function is to break down the food we consume into nutrients that the body can
utilize, making digestion the first crucial step. Following digestion, the body absorbs these nutrients through the walls of
the digestive tract, and then it uses them to produce energy and sustain life through the process of metabolism, which
encompasses both energy conversion and cellular processes.
QUESTION 2
What system controls the GI system?
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, CORRECT ANSWER
the parasympathetic nervous system
RATIONALE: The parasympathetic nervous system plays a crucial role in regulating various bodily functions, including
digestion, by stimulating the release of digestive enzymes and increasing gut motility, thus controlling the GI system.
This is achieved through its nerve fibers that release acetylcholine, a neurotransmitter that stimulates the contraction of
smooth muscle in the GI tract and promotes the digestive process.
QUESTION 3
What are the four organs of the GI system that are responsible for ingestion?
CORRECT ANSWER
mouth, salivary glands, pharynx, and esophagus
RATIONALE: The correct answer is based on the definition of ingestion, which is the process of taking food into the
body, and the specific roles of each organ in this process. The mouth, salivary glands, pharynx, and esophagus work
together to break down food, mix it with saliva, and transport it from the mouth to the stomach, marking the end of the
ingestion process in the GI system.
QUESTION 4
What three organs are responsible for absorption of nutrients?
CORRECT ANSWER
stomach, small intestine, and large intestine
RATIONALE: The stomach, small intestine, and large intestine are primarily responsible for absorption of nutrients
because the stomach breaks down food into smaller molecules, the small intestine further digests and absorbs most of
the nutrients into the bloodstream, and the large intestine absorbs water and electrolytes while also storing and
eliminating waste. This sequence of nutrient processing and absorption occurs in these organs due to their unique
structures and functions, with the small intestine's large surface area allowing for efficient nutrient uptake.
QUESTION 5
The mouth is where food is broken down. What enzyme helps in the chemical breakdown that is
secreted by the salivary glands?
CORRECT ANSWER
amylase
RATIONALE: Amylase is the correct enzyme because it specifically breaks down carbohydrates, such as starches, found
in food into simpler sugars, which is essential for further digestion. The salivary glands secrete amylase into the mouth
to initiate the chemical breakdown of food during the initial stages of digestion.
QUESTION 6
The function of the epiglottis is to:
a. Break down food particles
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, b. Digest food
c. Block off the tracheal tube
d. Aid in peristalsis
CORRECT ANSWER
c
RATIONALE: The epiglottis plays a crucial role in preventing food and liquids from entering the trachea, which is a
critical function in maintaining respiratory health. By positioning itself over the tracheal tube during swallowing, the
epiglottis effectively blocks off the tracheal tube, thereby ensuring that food and liquids follow the correct path through
the esophagus and into the digestive system.
QUESTION 7
THe esophagus performs ____ to propel food.
CORRECT ANSWER
peristalsis
RATIONALE: Peristalsis is the correct answer because it is a wave-like muscular contraction that helps to move food
through the digestive system, including the esophagus, by sequentially constricting and relaxing muscles to propel the
food forward. This process is essential for the esophagus to effectively transport food from the mouth to the stomach,
allowing for proper digestion and preventing food from entering the lungs.
QUESTION 8
What is the pH of the stomach?
CORRECT ANSWER
pH= 2
RATIONALE: The stomach's environment is highly acidic due to the presence of hydrochloric acid (HCl), which
dissociates into hydrogen ions (H+) and chloride ions (Cl-), increasing the concentration of hydrogen ions in the
stomach. This high concentration of hydrogen ions results in a low pH value, specifically around 2, which is
characteristic of the stomach's acidic environment.
QUESTION 9
After the breakdown in the stomach, the acidic mixtures becomes ____.
CORRECT ANSWER
chyme
RATIONALE: The acidic mixture in the stomach breaks down food into a liquid semifluid substance through a process
called digestion, where enzymes and acids chemically alter the food's composition. This transformed mixture is then
referred to as chyme, which can pass through the pyloric sphincter and into the small intestine for further nutrient
absorption.
QUESTION 10
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