Epithelial Tissue - Histo Lec Flashcards Preview

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Flashcards in Epithelial Tissue - Histo Lec Deck (94)
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1

aggregates or groups of cells organized to perform one or more specific functions.

tissues

2

Four basic types of tissues:
– covers body surfaces, lines body cavities and forms glands



Epithelium

3

Four basic types of tissues:
underlies or supports the other three basic tissues, both structurally and functionally.

Connective

4

Four basic types of tissues:
made up of contractile cells and is responsible for movement

Muscle

5

Four basic types of tissues:
receives, transmits, and integrates information from outside and inside the body to control activities of the body.

Nerve

6

Avascular tissues

epithelial tissue

7

Covers body surfaces,
As receptors for the special senses

epithelial tissue

8

lines body cavities,

epithelial tissue

9

and constitutes glands;

epithelial tissue

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Sheet of cells lying close together

epithelial tissue

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Continuous sheet w/ little extracellular matrix

epithelial tissue

12

Function of Epithelial Tissue

a. Diffusion of O2 and CO2 across the epithelial cells of lung alveoli and capillaries

Transcellular Transport

13

Function of Epithelial Tissue
b. Carrier-protein mediated transport of amino acids

Transcellular Transport

14

Function of Epithelial Tissue
c. Vesicle-mediated transport of IgA and other molecules

Transcellular Transport

15

Function of Epithelial Tissue

Occurs via endocytosis and pinocytosis (columnar epithelium of the intestines and proximal convoluted tubules in the kidney)

Absorption

16

Function of Epithelial Tissue
Occurs via exocytosis (different glands produce perspiration, oil, digestive enzymes and mucus)

Secretion

17

Function of Epithelial Tissue

From abrasion and injury by the epithelial layer of the skin and gall bladder.

Protection

18

Function of Epithelial Tissue
Lining of Kidney tubules filtering wastes from blood plasma

Filtration

19

Structure of simple squamous

Single Layer of flattened cells

20

Function of simple squamous

Absorption, and filtration
Not effective protection – single layer of cells

21

Location of simple squamous


Walls of capillaries, air sacs in lungs
Form serous membranes in body cavity
Mesothelium (lining of peritoneum and pleura )
Endothelium (lining of blood vessels)

22

Structure of simple cuboidal




Single layer of cube shaped cells

23

Function of simple cuboidal

Secretion and transportation in glands, filtration in kidneys

24

Location of simple cuboidal

Glands and ducts (pancreas & salivary), kidney tubules, covers ovaries

25

Structure of simple columnar







Elongated layer of cells with nuclei at same level

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Function of simple columnar

Absorption, Protection & Secretion

27

Special Features of simple columnar

Microvilli, finger-like projections of the apical surface, increase surface area for absorption
Goblet cells, single cell glands, produce protective mucus.

28

Location of simple columnar

Linings of entire digestive tract, gall bladder, uterus, kidney tubules

29

When open to body cavities, simple columnar are called ______

mucous membranes

30

Structure of pseudostratified

Irregularly shaped cells with nuclei at different levels – appear stratified, but aren’t.
All cells reach basement membrane

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