2. Histology of glands Flashcards
Exocrine
product is secreted into a duct
Endocrine
glands are ductless
Goblet cell (PAS)
secrete mucus
epithelial linings of the stomach and respiratory tract
Merocrine
products fuse with plasma membrane
exocytosis
Apocrine
free membrane bound vesicles containing product is released
Holocrine
Whole cell containing product is shed
Secretory adaptations of Protein secreting cells
large nucleus
abundant rough ER
Secretory adaptations of Mucin secreting cells
well developed golgi
secretory vesicles at cell apex
Secretory adaptations of Steroid secreting cells
well developed smooth ER
abundant mitochondria
vacuoles containing lipid
Acne
Production of androgens
stimulates the sebaceous (oil)
Excess sebum blocks the openings of the ducts
causes inflammation
Simple squamous
Function: passive transport of gases and fluids
Location: alveoli of lungs, mesothelium, endothelium
Simple cuboidal
Function: secretory, excretory, absorptive
Location: kidney, salivary glands, pancreas
Simple columnar
Function: highly secretory, excretory, absorptive
Location: digestive tract, gall bladder
Stratified squamous
Function: protective
Location: oral cavity, cervix, anal canal
Transitional
Function: stretching, protective
Location: bladder