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Explain the regenerative capacity of epithelial tissue.
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Epithelial tissue has a high regenerative capacity due to frequent exposure to friction and injury.
What is a unique feature of pseudostratified columnar epithelium?
It appears stratified due to the staggered arrangement of nuclei but is actually a single layer.
What are the four types of tissues in the human body?
Epithelial, Connective, Nervous, and Muscle tissue.
How does transitional epithelium support its function in organs like the bladder?
Transitional epithelium stretches to accommodate fluctuations in fluid volume.
Describe the function and a characteristic of simple squamous epithelium.
Simple squamous epithelium consists of a single layer of flat cells and is found at sites of rapid diffusion.
How do endocrine glands differ from exocrine glands in their method of secretion?
Endocrine glands secrete directly into the bloodstream, whereas exocrine glands secrete through ducts onto epithelial surfaces.
What makes glandular epithelium distinct within the epithelial tissue category?
Glandular epithelium specializes in producing and secreting substances such as hormones.
What is the basal lamina, and how does it contribute to epithelial tissue structure?
The basal lamina is a layer of glycoproteins and collagen providing structural support to the epithelial tissue.
What role do tight junctions play in epithelial tissue?
Tight junctions block the flow of fluids between cells, maintaining tissue integrity.
What is the importance of microvilli on the apical surface of epithelial cells?
Microvilli increase the surface area for absorption and secretion.
What are desmosomes and what function do they serve in epithelial tissue?
Desmosomes are structures that bind cells together, providing mechanical strength.
How does the classification of epithelial cells differ between simple and stratified epithelium?
Simple epithelium consists of a single cell layer, while stratified epithelium has multiple cell layers.
In terms of cell shape, how do squamous, cuboidal, and columnar cells differ?
Squamous cells are flat and scale-like, cuboidal cells are box-like, and columnar cells are tall and column-shaped.
Why is epithelial tissue described as 'avascular but innervated'?
Epithelial tissue lacks blood vessels (avascular) but receives nerve supply (innervated).
What distinguishes the apical surface from the basal surface in epithelial tissue?
The apical surface is exposed and may have microvilli or cilia, while the basal surface is attached and supported by the basal lamina and basement membrane.
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