glands Flashcards
what are the destinations of secretions?
Endocrine - glands with no ducts. Secretion s onto the bloodstream
Exocrine - glands with ducts
What are the three section to structure of the gland
Secretory parts
duct system
Branching
Explain the structure of the:
secretory parts?
Ducts (what is simple what is compund?)
The secretory part of gland is divided into:
- Unicellular/Multicellular
- Acinar (alveolar)/ tubular/ branched/ coiled
Multicellular gland with ducts that do not branch are - simple glands
Multicellular glands with branched ducts are - compound glands
Explain the naming of branching in structure of glands?
Main > interlobular > intralobular > intercalated
Give example of unicellular gland and where it can be found?
Goblet cell.
Found in the oesophagus (upper respiratory system)
Give example of three simple tubular multicellular glands and examples of where they can be found?
Simple tubular - intestinal glands
Simple coiled tubular - sweat glands (merocrine)
Simple branched tubular - gastric glands, mucus glands of oesophagus, toung.
Give two example of simple acinar glands and where they can b found?
Simple acinar alveolar) gland - these are not found in adults - part of early development stage of branched ducts
Simple branched alveolar - sebaceouse glands
what is the definition of compount gland?
If the ducts of the glands are branched
What are the two natures of secretion and explain properties?
Mucouse glands - glands that secrete mucus, that is rich in mucins (highly glycosylated polypeptides). These are hard to stain in H&E sections
Serouse glands - secretions (usually enzymes) are free of mucus, are watery. stain pink in H&E sections
Describe three methods of secretion?
Merocrine
Apocrine
Holocrine
Describe Merocrine?
Merocrine - exocytosis - membrane bound componment - approachescell membrane …. membrane binds to plasma membrane…. component is still continuity with extracellular space…. plasma membrane in transiently larger…. membran in retrieved…. plasma membrane is stable
What is Apocrine?
Apocrine - non membrane bound material (e.g lipid) approaches cell wall… pushes against apical membrane… apical membrane extends around material forming a droplet… material is out of cell…. membrane is transiently small…. membrane is added to stabilise it.
What is Holocrine?
holocrine - disintegration of entire cell…… Cell contents are released to surrounding area….. discharge of whole cell.
whta is oposite of merocrine
edocytosis
What are merocrine and endocytosis called when paired? Describe what it is?
Epithelial transport
- material taken in by endocytosis
- material transported via vassicle to opposite site
- material released at opposite site via merocrine (exocytosis)
