30 Questions
Which of the following is NOT one of the four basic tissues?
Epithelium
What is the main function of epithelial tissue?
Covering and lining surfaces
What does it mean when it is stated that epithelium is avascular tissue?
It has no blood vessels
Which type of cell arrangement is found in glands?
Placed very close to each other
What are the three distinct surface domains of polarized cells?
Apical, basal, and lateral
What is a characteristic of cell junctions in epithelial tissue?
They are present in epithelial cells
Which type of cell arrangement is characteristic of epithelial tissue in glands?
Placed very close to each other
What is the main function of intercellular junctions in epithelial tissue?
To connect adjacent cells
What are the distinct surface domains of polarized cells in epithelial tissue?
Apical, basal, and lateral domains
Which of the following is a characteristic of cell arrangements in epithelial tissue?
Cells are arranged in sheets
What is the function of intercellular junctions in epithelial tissue?
To allow for communication between cells
Which of the following is a characteristic of polarized cells in epithelial tissue?
They have three distinct surface domains
Which type of cell arrangement is characteristic of epithelial tissue in glands?
Or as masses
Which one of these is a characteristic of cell arrangements in epithelial tissue?
Arranged as sheets
What are the distinct surface domains of polarized cells in epithelial tissue?
Apical, basal, and lateral domains
Which of the following is NOT one of the four basic types of animal tissue?
Epithelial tissue
What is the outermost layer of the skin called?
Epidermis
What is the function of compound epithelium?
Protection
What is the classification of epithelial tissues based on?
The shape and function of the cells
What is the function of stratified epithelium?
To provide mechanical or chemical protection
Which type of epithelium lines the inside of the mouth and the esophagus?
Stratified squamous epithelium
What is the function of the basement membrane in epithelial tissue?
To provide mechanical support for the tissue
What is the function of adherens junctions in cell junctions?
To attach both cells' microfilaments
Which type of cell junction attaches the epithelial cell to the basement membrane?
Hemidesmosomes
What are gap junctions made up of?
Proteins called connexins
Which germ layers do epithelial tissues derive from?
All of the above
Which type of cell junction attaches the epithelial cell to the basement membrane?
Hemidesmosomes
Which proteins make up gap junctions?
Connexins
Which germ layers give rise to epithelial tissues?
All three germ layers
What is the major difference between endocrine glands and exocrine glands?
Endocrine glands secrete into a duct, while exocrine glands secrete into the extracellular space
Study Notes
Epithelial Tissue
- NOT one of the four basic tissues: Connective tissue, Muscle tissue, Nervous tissue, and NOT Blood
- Main function of epithelial tissue: forms the lining of organs, glands, and other body surfaces
- Epithelium is avascular tissue: means it does not have a direct blood supply
Cell Arrangement in Epithelial Tissue
- In glands: cells are arranged in clusters or acini
- In epithelial tissue: cells are closely packed and arranged in one or multiple layers
- In polarized cells: three distinct surface domains: apical, lateral, and basal surfaces
Cell Junctions in Epithelial Tissue
- Characteristic: intercellular junctions, adherens junctions, and gap junctions
- Intercellular junctions: hold cells together, maintain tissue integrity, and facilitate cell-cell communication
- Gap junctions: made up of connexins, allow for direct cell-cell communication
- Adherens junctions: attach epithelial cells to the basement membrane
Epithelial Tissue Classification
- Based on the number of layers and the shape of cells
- Simple epithelium: single layer of flat, cube-shaped, or columnar cells
- Stratified epithelium: multiple layers of cells
- Compound epithelium: multiple layers of cells with different shapes
Epithelial Tissue Functions
- Forms the outermost layer of the skin: epidermis
- Lines the inside of the mouth and the esophagus: stratified squamous epithelium
- Basement membrane: separates epithelial tissue from underlying connective tissue
- Function of compound epithelium: protects underlying tissues
- Function of stratified epithelium: protects underlying tissues and allows for stretching
Glands and Gap Junctions
- Exocrine glands: secrete substances through ducts to the surface of the body
- Endocrine glands: secrete hormones directly into the bloodstream
- Gap junctions: allow for direct cell-cell communication, composed of connexins
Germ Layers and Epithelial Tissues
- Epithelial tissues derive from ectoderm and endoderm germ layers
Test your knowledge on epithelial tissue with this quiz! Learn about the characteristics, functions, and locations of epithelium, including its role in lining the intestine and covering fingertips. Challenge yourself and expand your understanding of this important type of tissue.
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