Flashcards in Glands Deck (19):
Define glandular tissue
-Type of epithelia cell (an aggregation of cells) which are specialised for secretion
What is an exocrine gland?
-A gland which secretes to the outside of the body via ducts
What is an endocrine gland?
A ductless gland which secretes into the bloodstream
What type of glandular structures are there?
Where do unicellular gland secrete onto?
What is endocytosis?
-Cell makes contact with extracellular material
-Cell surrounds material
What is transepithelial transport?
-1)Endocytosis at one membrane
3)secretion/exocytosis at opposite membrane
Describe the secretions of serous glands
-Watery and free of mucus
-Often contain enzymes
-Stain eosinophilic with H+E
Which epithelia cells continually regenerate?
Describe merocrine secretion
-Membrane bound vesicle approaches cell surface
-Fuses with plasma membrane
-Contents released into extracellular space
-PM transiently larger
Describe apocrine secretions
-Non-membrane bound structures approach pm
-contacts apical membrane and pushes up
-membrane surrounds droplet and pinches off
-membrane added to regain size
Describe holocrine secretion
-The cell disintegrates and releases the whole cell contents
What are the three salivary glands and what are their secretion types?
-Submandibular ->both (mucus pushes serous to edge of cell forming a cresent)
What is an adenocarcinoma?
-Malignant neoplasm from glandular epithelial cells
Why is glycosylation of proteins important and where does it occur?
-Adds biochemical specificity to the protein
-Occurs in the golgi
How do proteins migrate through the cisternae of the golgi?
-Swelling at the ends of the cisternae
-Buds off into vesicles
-Join the next membrane disc
What is the fate of the vesicles produced from the golgi?
-Enter regulatory secretory pathway
-Enter constitutive pathway
-Remain in the cell as lysosomes
-Enter the glycocalyx of the pm
What does the glycocalyx of the pm do?
-Adds biological specificity
-Adherence of cell
-Protection - lubrication