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Mucous vs Serous Glands Differences
What are the characteristics of mucous glands?
Flat dense nuclei and foamy cytoplasm; larger cell type.
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Mucous vs Serous Glands Differences
What type of cell displays modifications that improve the efficiency of absorption?
Intestinal absorptive cell.
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Simple Squamous Epithelium Locations and Functions
Where in the body can you find simple squamous epithelia?
Lining blood vessels, lymphatics, and body cavities.
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Pseudo-stratified Epithelium Definition
What type of epithelium lines the trachea and bronchi?
Pseudostratified epithelium.
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Respiratory Epithelium Characteristics
What are the modifications to the epithelial lining of the respiratory system?
Cilia and Goblet Cells for mucus secretion.
Which intracellular structures does haematoxylin stain?
Negatively charged structures – DNA, RNA (ribosomes).
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Mucous vs Serous Glands Differences
What are the characteristics of serous glands?
Eosinophilic cytoplasm/granules and round vesicular nucleus; smaller cell type.
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PAS Technique and Glycoproteins
Which cell types will be PAS positive?
Any cell containing significant accumulation of glycoprotein/mucus – goblet cells, mucus secretory cells, or exocrine glands.
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GI Tract Epithelium and Modifications
What modifications does the GI tract lining show?
Absorptive cell microvilli and secretory capability for secretion of mucus.
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Exocrine vs Endocrine Glands
What are the differences between exocrine and endocrine glands?
Exocrine glands secrete onto a body surface (internal or external) and endocrine glands secrete into the bloodstream.
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Basal Lamina and Its Characteristics
Where is the basal lamina located and is it PAS positive?
At the base of an epithelium and it is PAS positive due to the presence of glycoproteins.
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Simple Squamous Epithelium Locations and Functions
What are the functions of simple squamous epithelium in body cavities?
Low friction, selective barrier for passage of immune cells and fluid.
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Pseudo-stratified Epithelium Definition
Why is a pseudo-stratified epithelium so called?
The nuclei are in multiple rows, but the cells are in a single layer.
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PAS Technique and Glycoproteins
What is the chemical nature of substances stained by the PAS technique?
Saccharide structures of glycoproteins.
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GI Tract Epithelium and Modifications
What type of epithelium lines the GI tract?
Modified columnar epithelium.
