Epithelial Glands and Secretions Flashcards
Release hormones
Endocrine gland
No ducts
Hormones released by endocrine glands go into the _______ _______ and directly into the __________ by __________ glands
interstitial fluid
Bloodstream
Endocrine
Produce secretions onto epithelial surfaces
Secretions go through ducts
Exocrine glands
Examples of secretions released by exocrine glands
Mucus, sweat, oil, earwax, saliva, digestive enzymes
Modes of secretion for glandular epithelia
Merocrine secretion
Apocrine secretion
Holocrine secretion
Produced in Golgi Apparatus
Merocrine secretion
Apocrine Secretion
Released by vesicles (exocytosis)
Merocrine secretion
Sweat glands are an example of this secretion
Merocrine secretion
Released by shedding cytoplasm
Apocrine secretion
Sebaceous glands are an example of this secretion
Holocrine secretion
Mammary glands are an example of this secretion
Apocrine secretion
Gland cells are replaced by stem cells in what secretion?
holocrine secretion
Watery secretions are released by _______ glands
serous
________ glands release mucins
Mucous glands
______ ________ glands secrete both serous and mucous
Mixed exocrine
Glandular epithelia’s types of secretions:
Serous glands-watery secretions
Mucous glands-secrete mucins
Mixed exocrine glands-both serous and mucous
In this type of secretion, the product is released from secretory vesicles at the apical surface of the gland cell by exocytosis
Merocrine secretion
This type of secretion involves the loss of the apical cytoplasm, inclusions, secretory vesicles, and other cytoplasmic components. These are all shed in the process.
Apocrine secretion
The gland cell then grows and repairs itself before it releases additional secretions
Apocrine secretion
Occurs as superficial gland cells burts
Holocrine secretion
Continuedsecretion involving the replacement of these cells through the mitotic divisions of underlying stem cells
Holocrine secretion
These are the only unicellular exocrine glands
Mucous (aka goblet) cells
Scattered among epithelia and can be found in intestinal lining
Mucous (aka goblet) cells
Unicellular glands
Mucous (aka goblet) cells
Glandular epithelia’s structure is comprised of _________ __________________ which are made of __________ _________
Unicellular glands
Mucous/goblet cells
Multicellular glands Structure of the duct can be:
- Simple (undivided)
* Compound (divided)
Multicellular glands Shape of secretory portion of the gland can be:
- Tubular (tube shaped)
* Alveolar or acinar (blind pockets)
Multicellular glands Relationship between ducts and glandular areas are:
• Branched (several secretory areas sharing one duct)
SIMPLE
TUBULAR example
•Intestinal glands
SIMPLE COILED
TUBULAR example
•Merocrine sweat
glands
SIMPLE BRANCHED
TUBULAR examples
•Gastric glands
•Mucous glands
of esophagus,
tongue, duodenum
SIMPLE ALVEOLAR
(ACINAR) examples
•Not found in adult; a
stage in development
of simple branched
glands
SIMPLE BRANCHED
ALVEOLAR examples
•Sebaceous (oil)
glands
COMPOUND
TUBULAR examples
•Mucous glands (in mouth) •Bulbourethral glands (in male reproductive system) •Testes (seminiferous tubules)
COMPOUND ALVEOLAR
(ACINAR) examples
•Mammary glands
COMPOUND
TUBULOALVEOLAR
•Salivary glands
•Glands of respiratory
passages
•Pancreas
