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Cell Apical Surface and Microvilli Quiz

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Questions and Answers

What is the function of microvilli in the cell?

To increase the surface area of the cell and aid in absorption and secretion (correct)

To provide structural support to the cell membrane

To facilitate the movement of fluid and suspended matter

To store enzymes for future use

How does the length of cilia compare to that of microvilli?

Cilia are longer but narrower than microvilli

Cilia are shorter but wider than microvilli

Cilia are longer and wider than microvilli (correct)

Cilia are shorter and wider than microvilli

In which type of cells are motile cilia abundant?

Connective tissue cells

Squamous cells

Nervous tissue cells

Cuboidal or columnar cells (correct)

What is the average length of a microvillus?

1 μm Signup and view all the answers

How do microvilli aid in nutrient absorption?

By increasing the surface area of the cell for absorption Signup and view all the answers

What is the main function of primary cilia?

Sensing urine flow in the kidney Signup and view all the answers

What is the main difference between cilia and stereocilia?

Cilia are hair-like structures, while stereocilia resemble microvilli Signup and view all the answers

Where are zonula occludens primarily located?

Most apically situated in cell junctions Signup and view all the answers

How do stereocilia differ from microvilli?

Stereocilia have a motile core of actin filaments, while microvilli do not Signup and view all the answers

What is the primary function of zonula occludens?

Preventing the flow of materials between cells Signup and view all the answers

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.

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Description

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.