Apical 2 Flashcards
(12 cards)
What is the apical surface of epithelial cells?
The top portion which faces the external environment or body lumen
It may have microvilli or cilia that increase surface area.
What are microvilli?
Projections that increase the surface area of epithelial cells
They are often found on the apical surface and are involved in absorption.
What is the primary function of epithelial cells?
Protection, absorption, and secretion
Epithelial cells play a major role in forming barriers and facilitating the exchange of substances.
Define simple epithelium.
A single layer of cells
It is involved in filtration and absorption.
What is cilia?
Hair-like structures that help in the movement of substances across the epithelial surface
Cilia are often found in respiratory tract epithelium.
What is the difference between simple and stratified epithelium?
Simple epithelium has one layer, while stratified epithelium has multiple layers
Stratified epithelium is often found in areas subject to abrasion.
Fill in the blank: The basal surface of epithelial cells is _______.
[the surface that faces the underlying connective tissue]
True or False: All epithelial cells are exposed to the external environment.
False
Some epithelial cells line internal organs and are not directly exposed to the environment.
What is the role of epithelial cells in the skin?
Protection and barrier against environmental factors
The skin epithelium also plays a role in sensation and thermoregulation.
What type of epithelium is characterized by multiple layers of cells?
Stratified epithelium
This type of epithelium is suited for areas that experience friction and wear.
What is the role of epithelial cells in secretion?
To release substances like hormones, enzymes, and mucus
Epithelial cells in glands are specialized for secretion.
