histo lec - glands Flashcards Preview

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Flashcards in histo lec - glands Deck (16):
1

Originate from an epithelium that penetrates C.T and forms secretory units

glands

2

protein in aqueous solution: hormones, acids, oils.

Secretion

3

Consists of a functional portion (parenchyma) of secretory and ductal epithelial cells, which is separated by a basal lamina from supporting connective tissue elements (Stroma)

glands

4

Classification based on the site of secretion:

exocrine
endocrine
paracrine

5

Classification based on the site of secretion
No duct, release secretion into blood vessels
Products are called hormones
Thyroid, adrenal and pituitary glands

endocrine

6

Classification based on the site of secretion
Contain ducts, empty onto epithelial surface
Sweat glands, Oil glands, Salivary glands, Mammary glands

Exocrine glands

7

Classification based on the site of secretion
secrete into the local extracellular space

Paracrine glands

8

type of Exocrine glands

unicellular
multicellular

9

glands composed of single cell (goblet cell)

unicellular

10

Multicellular glands secrete the following substances:
– a viscous material that usually protects or lubricates cell surfaces (e.g. goblet cells, salivary glands, surface cells of stomach).

Mucus

11

Multicellular glands secrete the following substances
- contain both mucous and serous components

Mixed secretions

12

Multicellular glands secrete the following substances:
– are watery and often rich in enzymes (e.g parotid gland and pancreas)

serous

13

Mechanisms of Secretion

merocrine, holocrine, apocrine

14


Just released by exocytosis without altering the gland at all.
Ex: Sweat glands and salivary glands

Merocrine

15


The gland ruptures and releases secretion and dead cells as well.
Disintegration of cells
Sebaceous (oil glands on the face) only example

Holocrine

16


Part of the apical cytoplasm of the secretory cell is released along with contents
Ex: Lactating mammary gland

Apocrine

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