Textbook Question
The site of production of cholecystokinin is:
a. The stomach
b. The small intestine
c. The pancreas
d. The large intestine
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Ch. 23 The Digestive System
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034
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Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units21
- Ch. 4 Tissue: The Living Fabric20
- Ch. 5 The Integumentary System11
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton14
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue19
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity32
- Ch. 14 The Autonomic Nervous System19
- Ch. 15 The Special Senses26
- Ch. 16 The Endocrine System23
- Ch. 17 Blood25
- Ch. 18 The Cardiovascular System: The Heart24
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues14
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses27
- Ch. 22 The Respiratory System21
- Ch. 23 The Digestive System31
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System26
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System24
- Ch. 28 Pregnancy and Human Development25
- Ch. 29 Heredity11
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Not the one you use?Change textbook
Chapter 23, Problem 8
Which of the following is not characteristic of the colon?
a. It is divided into ascending, transverse, and descending portions
b. It contains abundant bacteria, some of which synthesize certain vitamins
c. It is the main absorptive site
d. It absorbs much of the water and salts remaining in the wastes
Verified step by step guidance1
Step 1: Begin by understanding the primary functions of the colon. The colon is part of the large intestine and is primarily responsible for absorbing water and salts, compacting waste into feces, and hosting bacteria that synthesize certain vitamins like vitamin K and some B vitamins.
Step 2: Review the anatomical divisions of the colon. The colon is divided into ascending, transverse, descending, and sigmoid portions, which are structural characteristics of this organ.
Step 3: Analyze the role of bacteria in the colon. The colon contains abundant bacteria that play a role in synthesizing certain vitamins and aiding in digestion, which is a characteristic feature of the colon.
Step 4: Evaluate the absorptive function of the colon. While the colon absorbs water and salts, the small intestine is the main site for nutrient absorption, including carbohydrates, proteins, and fats. This distinction is key to answering the question.
Step 5: Compare the options provided in the question with the characteristics of the colon. Identify the option that does not align with the colon's primary functions or structure, focusing on the fact that the colon is not the main absorptive site for nutrients.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Anatomy of the Colon
The colon, or large intestine, is divided into several sections: the ascending, transverse, descending, and sigmoid colon. Each section plays a specific role in the digestive process, primarily in the absorption of water and electrolytes, as well as the formation of feces.
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Clitoral Anatomy
Bacterial Flora in the Colon
The colon hosts a diverse community of bacteria, known as gut microbiota, which are essential for various functions, including the synthesis of certain vitamins like vitamin K and some B vitamins. These bacteria also aid in the fermentation of undigested carbohydrates, contributing to overall gut health.
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Absorptive Functions of the Colon
While the colon does absorb water and salts from waste material, it is not the primary site for nutrient absorption; that role is mainly fulfilled by the small intestine. The colon's main function is to reclaim water and electrolytes, thus concentrating waste for excretion.
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Related Practice
Textbook Question
Name the six functional activities of the digestive system.
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Textbook Question
The sphincter between the stomach and duodenum is:
a. The pyloric sphincter
b. The gastroesophageal sphincter
c. The hepatopancreatic sphincter
d. The ileocecal valve
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Textbook Question
The parasympathetic nervous system influences digestion by:
a. Relaxing smooth muscle
b. Stimulating peristalsis and secretory activity
c. Constricting sphincters
d. None of these
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Textbook Question
The digestive juice product containing enzymes capable of digesting all four major foodstuff categories is:
a. Pancreatic
b. Gastric
c. Salivary
d. Biliary
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Textbook Question
The gallbladder
a. Produces bile
b. Is attached to the pancreas
c. Stores and concentrates bile
d. Produces secretin
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