Textbook Question
Imagine that a disease turns the simple epithelia of the lungs, kidney tubules, and intestines into keratinized stratified squamous epithelia. What effect would this change in form have on the functions of these tissues?
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Ch. 4 Histology
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology26
- Ch. 2 The Chemistry of Life38
- Ch. 3 The Cell55
- Ch. 4 Histology47
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System36
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System42
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart30
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity45
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Chapter 4, Problem L3.B5a
Epithelial cells of the kidneys have pumps that drive the transcellular transport of sodium ions.
Is this epithelium likely to be simple or stratified? Why?
Verified step by step guidance1
Understand the function of epithelial cells in the kidneys: These cells are specialized for processes like filtration, absorption, and secretion, which are critical for maintaining homeostasis.
Recall the difference between simple and stratified epithelium: Simple epithelium consists of a single layer of cells, while stratified epithelium has multiple layers. Simple epithelium is typically involved in processes requiring efficient transport, whereas stratified epithelium provides protection in areas subject to wear and tear.
Consider the role of sodium ion pumps in transcellular transport: Sodium ion pumps actively move sodium ions across the cell membrane, which is an energy-intensive process requiring direct access to the extracellular and intracellular environments.
Evaluate the structural requirements for efficient transcellular transport: A single layer of cells (simple epithelium) minimizes the distance for transport and maximizes efficiency, making it ideal for processes like ion exchange and absorption.
Conclude that the epithelium is likely to be simple: The need for efficient transport of sodium ions suggests that the epithelial cells are arranged in a single layer to facilitate rapid and direct movement of ions across the cell membrane.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Epithelial Tissue Types
Epithelial tissue is classified into two main types: simple and stratified. Simple epithelium consists of a single layer of cells, allowing for efficient absorption and secretion, while stratified epithelium has multiple layers, providing protection against abrasion. The type of epithelium present in a specific location often correlates with its functional requirements.
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Guided course
07:25
Identifying Types of Epithelial Tissue Example 1
Transcellular Transport
Transcellular transport refers to the movement of substances across the epithelial cells, involving processes such as active transport and facilitated diffusion. In the kidneys, sodium ions are actively transported through epithelial cells, which is crucial for maintaining electrolyte balance and fluid homeostasis. This process typically occurs in simple epithelia, where a single layer allows for efficient transport.
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02:37Active Transport
Function of Kidney Epithelium
The epithelium of the kidneys, particularly in structures like the nephron, plays a vital role in filtering blood and reabsorbing essential substances. The presence of pumps for sodium ions indicates a high level of metabolic activity and transport function, which is characteristic of simple epithelium. This specialization supports the kidneys' role in regulating body fluids and electrolytes.
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1:00The Kidneys Example 1
Related Practice
Textbook Question
Certain types of cancerous lung tumors can secrete hormones normally made by the pancreas, adrenal gland, and hypothalamus. What prevents such secretion from happening in healthy cells?
Textbook Question
If you were to cut through epithelial tissue without penetrating the basement membrane, would you expect bleeding to occur? Why or why not?
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Textbook Question
In the disease scleroderma, excessive collagen, glycosaminoglycans, and glycoproteins are produced and deposited in tissues throughout the body. Predict the effects of this disease.
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Textbook Question
In the disease pulmonary fibrosis, elastic fibers of the lung are destroyed and replaced with collagen fibers. Predict the effect this would have on breathing.
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Textbook Question
Predict which organelles are likely to be abundant in cells such as fibroblasts that actively produce and secrete proteins.
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