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What type of epithelium is characterized by almost all sides of the cells being equal and is found in the ovary lining and kidney tubules?
What type of epithelium is characterized by almost all sides of the cells being equal and is found in the ovary lining and kidney tubules?
- Stratified Epithelium
- Simple Columnar Epithelium
- Simple Cuboidal Epithelium (correct)
- Simple Squamous Epithelium
What is the primary function of simple columnar epithelium?
What is the primary function of simple columnar epithelium?
Filtration
Which of the following types of epithelium is found in the trachea?
Which of the following types of epithelium is found in the trachea?
- Pseudo-stratified Columnar Epithelium (correct)
- Stratified Squamous Epithelium
- Simple Squamous Epithelium
- Transitional Epithelium
A vascular epithelium is provided with blood vessels for nourishment.
A vascular epithelium is provided with blood vessels for nourishment.
The _____ epithelium is found in the urinary bladder and can stretch.
The _____ epithelium is found in the urinary bladder and can stretch.
What is the main function of endocrine glands?
What is the main function of endocrine glands?
Match the following types of epithelium with their characteristics:
Match the following types of epithelium with their characteristics:
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Study Notes
Histology Overview
- Simple cuboidal epithelium has nearly equal cell sides; located in ovary lining and kidney tubules.
- Simple columnar epithelium features greater height than width; primarily found in the stomach and intestines, serving a filtration function.
- Variations of columnar epithelium include:
- Ciliated Columnar: Cilia aid in removing mucus and dust.
- Columnar with Striated Border: Contains microvilli for absorption and protection, located in intestines.
- Pseudo-stratified Columnar: Appears layered but consists of single-layer cells with cilia, found in the trachea, where basal cells undergo mitosis and goblet cells produce mucus.
Embryonic Development of Epithelial Tissues
- Ectoderm: Forms skin epithelium and parts of the nervous system.
- Endoderm: Develops into digestive and respiratory tubes.
- Mesoderm: Gives rise to connective tissues, bones, and muscles.
General Characteristics of Epithelium
- Epithelial tissues cover surfaces and line cavities; one surface is free while the opposite is attached via:
- Basement Membrane: Supports the epithelium and connects it to the underlying tissue.
- Tunica Propria: Connective tissue that nourishes epithelium through blood vessel projections.
- Epithelia are avascular, obtaining nutrients via osmosis and diffusion.
- Most epithelial tissues are moist, except for skin epithelium, which is dry.
Classification of Epithelium
- Simple Epithelium: Single layer of cells.
- Simple Squamous Epithelium: Flattened cells; includes:
- Endothelium: Lines heart cavity and blood vessels.
- Mesothelium: Lines internal organs.
- Simple Squamous Epithelium: Flattened cells; includes:
- Stratified Epithelium: Multiple layers of cells.
- Examples include non-keratinizing and keratinizing stratified squamous epithelium found in various bodily linings.
- Transitional Epithelium: Located in the urinary bladder; cells change shape when stretched.
Glands
- Glands form from epithelial cells growing inward into connective tissue, producing secretory units tailored to physiological needs.
- Exocrine Glands: Have ducts to secrete substances outside the body.
- Endocrine Glands: Ductless, releasing hormones directly into the bloodstream to activate target organs.
Classification of Exocrine Glands
- Glands can be classified by the shape of their secretory units, adapting their functions to the body's requirements.
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