10 Questions
What is the function of microvilli in the cell?
To increase the surface area of the cell and aid in absorption and secretion
How does the length of cilia compare to that of microvilli?
Cilia are longer and wider than microvilli
In which type of cells are motile cilia abundant?
Cuboidal or columnar cells
What is the average length of a microvillus?
1 μm
How do microvilli aid in nutrient absorption?
By increasing the surface area of the cell for absorption
What is the main function of primary cilia?
Sensing urine flow in the kidney
What is the main difference between cilia and stereocilia?
Cilia are hair-like structures, while stereocilia resemble microvilli
Where are zonula occludens primarily located?
Most apically situated in cell junctions
How do stereocilia differ from microvilli?
Stereocilia have a motile core of actin filaments, while microvilli do not
What is the primary function of zonula occludens?
Preventing the flow of materials between cells
Study Notes
Cell Structures and Functions
- Microvilli are small, finger-like projections on the surface of cells that increase the cell's surface area, aiding in nutrient absorption.
- Microvilli are shorter than cilia, with an average length of 1-2 micrometers.
Cilia
- Motile cilia are abundant in cells that require movement, such as those in the respiratory tract, where they help move mucus and debris out of the lungs.
- The main function of primary cilia is to sense the environment and respond to signals.
Stereocilia vs. Microvilli
- Stereocilia are longer and thicker than microvilli, and are typically found in sensory organs, such as the inner ear and eye, where they aid in detecting sound and light waves.
Cell Junctions
- Zonula occludens are a type of cell junction primarily located in the tight junctions of epithelial cells, serving as a barrier to prevent the passage of molecules.
- The primary function of zonula occludens is to regulate the flow of molecules between cells.
Test your knowledge about the apical modification microvilli, which are small finger-like projections extending from the apical surface of the cell. Learn about the characteristics and functions of microvilli in specialized epithelia for absorption.
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