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Chapter 24: Problem 31

How can squamous epithelia, which have a high surface area-to-volume ratio, both facilitate diffusion and prevent damage from abrasion? a. Single layers of squamous epithelia facilitate gas, nutrient or waste exchange, whereas stratified layers provide protection but are not replaceable following damage. b. Stratified layers of squamous epithelia facilitate gas, nutrient or waste exchange, whereas single layers provide protection and are replaceable following damage. c. Single layers of squamous epithelia facilitate gas, nutrient or waste exchange whereas stratified layers provide protection and are replaceable following damage. d. Single layers of squamous epithelia facilitate only exchange of gases by diffusion, whereas stratified layers provide protection and are replaceable following damage

Short Answer

Expert verified
The correct answer is c: Single layers facilitate exchange while stratified layers provide protection and are replaceable following damage.

Step by step solution

01

Understand the Function of Squamous Epithelia

Squamous epithelia can be either single-layered (simple) or multi-layered (stratified). Each type has a different function.
02

Identify the Functions of Single Layers

Single layers (simple squamous epithelia) facilitate diffusion of gases, nutrients, and waste products due to their thinness.
03

Identify the Functions of Stratified Layers

Stratified layers (stratified squamous epithelia) are designed to protect underlying tissues from abrasion and are replaceable following damage due to their multiple layers.
04

Eliminate Incorrect Options

Option a is incorrect because it states that stratified layers are not replaceable following damage. Option b is incorrect because it reverses the functions of single and stratified layers. Option d is incorrect because single layers facilitate more than just gas exchange.
05

Select the Correct Answer

Option c correctly explains that single layers facilitate exchange and stratified layers provide protection and are replaceable.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

simple squamous epithelia
Simple squamous epithelia consist of a single layer of flat cells. These cells are extremely thin, which makes them very efficient at allowing certain things to pass through them via diffusion.

This is especially crucial in areas where substances need to be quickly and efficiently transported, such as:
  • Alveoli in the lungs for gas exchange
  • Lining blood vessels for nutrient and waste exchange
  • Parts of the kidney for filtration
Due to their thinness, simple squamous cells help facilitate the exchange of gases, nutrients, and waste products. This key quality makes them vital in ensuring that tissues and organs acquired essential materials while getting rid of metabolic waste.
stratified squamous epithelia
Stratified squamous epithelia are made up of multiple layers of cells. This type of epithelial tissue is specialized for protection.

The multilayered structure allows for two main advantages:
  • Enhanced durability: Multiple layers can withstand abrasions and mechanical stresses.
  • Replacability: Surface cells can be shed and replaced by new cells from beneath.
Common locations include:
  • Skin epidermis
  • Linings of the mouth, throat, and esophagus
  • Certain parts of the reproductive tract
These locations often are prone to friction and need robust protection to prevent tissue damage.
tissue protection
The primary role of stratified squamous epithelial cells is tissue protection. This type of tissue forms a barrier against:
  • Mechanical damage: Protects against scrapes, cuts, and other physical injuries.
  • Chemical damage: Provides resistance to harsh substances.
  • Pathogen entry: Acts as a shield against bacteria and viruses.
Additionally, by continuously renewing themselves, these cells ensure that the protective layer remains intact even after damage. Thus, stratified squamous epithelia are crucial defense mechanisms in the body's various environments.
diffusion in cells
Diffusion is essential for maintaining homeostasis within tissues and organs. Simple squamous epithelia play a crucial role in facilitating this process due to the following reasons:
  • Minimal thickness: Their single-cell thickness promotes rapid diffusion.
  • Large surface area: A high surface area-to-volume ratio enhances efficiency.
Areas where diffusion is essential include:
  • Alveoli in the lungs: For oxygen and carbon dioxide exchange.
  • Blood capillaries: For nutrient and waste product exchange between blood and tissues.
  • Kidney glomeruli: For filtration of blood to form urine.
In summary, the structure and function of simple squamous epithelia are perfectly suited to enable efficient diffusion, ensuring essential biological processes proceed seamlessly.

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Most popular questions from this chapter

The body sizes of organisms vary and tends to be correlated with the region in which the organisms are found. Why do organisms at different latitudes tend to have different body sizes, and what is the relationship between heat loss and body size in an organism? a. Temperature varies by latitude, and body size affects heat retention and loss. Smaller organisms lose heat at a slower rate than larger organisms because they have a smaller surface area for their mass. b. Temperature varies by latitude, and body size affects heat retention and loss. Smaller organisms lose heat at a faster rate than larger organisms because they have a greater surface area for their mass. c. Temperature varies by latitude, and body size affects heat retention and loss. Larger organisms lose heat at a faster rate than smaller organisms because they have a greater surface area for their mass. d. Temperature varies by latitude, and body size affects heat retention and loss. Smaller organisms lose heat at a faster rate than larger organisms because they have a smaller surface area for their mass.

What is the term for a hard covering or shell that provides protection and muscle attachment? a. apodeme b. fusiform c. exoskeleton d. endotherm

One process that is under the control of a negative feedback loop is red blood cell production. These cells carry oxygen to all of the body cells, and remove some carbon dioxide. What would most likely happen if an individual had a sufficient number of red blood cells? a. The individual would have increased red blood cell production. b. The individual鈥檚 body would start destroying the red blood cells. c. The individual鈥檚 body would cease production of new red blood cells. d. The individual would produce the same amount of red blood cells.

How does an asymmetrical body plan differ from radial or bilateral body plans? a. Asymmetrical organisms can produce equal halves if cut along a certain plane, whereas radially and bilaterally symmetric organisms have no distinct pattern. b. Asymmetrical organisms have no distinct pattern, whereas radially and bilaterally symmetric organisms can produce equal halves if cut along a certain plane. c. Asymmetrical organisms produce equal halves if cut along a certain plane with no definite right or left side, whereas radially and bilaterally symmetric organisms can produce equal halves. d. Asymmetrical organisms produce equal halves if cut along a certain plane with definite right and left sides, whereas radially and bilaterally symmetric organisms can produce equal halves.

Why are most organisms with exoskeletons relatively small? a. Increases in body weight increase body size by a factor of eight, and the chitin thickness of the exoskeleton has to significantly decrease to accommodate increase in body size. b. Doubling of body size increases body weight by a factor of eight, and the chitin thickness of the exoskeleton has to significantly decrease to accommodate weight increase. c. Increases in body weight increase body size by a factor of eight, and the chitin thickness of the exoskeleton has to significantly increase to accommodate increase in body size. d. Doubling of body size increases body weight by a factor of eight, and the chitin thickness of the exoskeleton has to significantly increase to accommodate weight increase.
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