Chapter 4: Tissue: the Living Fabric Flashcards Preview

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Flashcards in Chapter 4: Tissue: the Living Fabric Deck (181)
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1

Tissues: definition

Groups of cells that work together to perform a specific function

2

4 types of tissues

1. Epithelial
2. Connective
3. Muscle
4. Nerve

3

Epithelial Tissue

1. Composed almost entirely of cells
2. Form continuous sheets held together by tight junctions and desmosomes
3. Supported by connective tissue - reticular and basal laminae (basement membrane).
4. Avascular but innervated - contains no blood vessels but supplied by nerve fibers
5. Regenerative - rapidly replaces lost cells by cell division

4

The basement membrane is like

double sided sticky tape

5

How permeable is epithelial tissue to water? why?

Waterproof like a pool liner. It's a continuous sheet. There are no spaced between the cells which makes it waterproof.

6

Which layer of skin is the oldest?

The surface. The deepest layers of skin are the newest.

7

Naming tissues - 1st name is based on...

number of layers. Simple, stratified

8

Tissues that are classified as simple are used for

filtering and diffusion

9

Tissues that are classified as stratified are

places that shed. surface of skin, mouth, etc

10

Naming tissues - last name is based on...

shape. squamous (squatty), cuboidal (cube-like), columnar (column-like).

11

Epithelia: Simple Squamous - Structure

Single layer of flattened cells with disc-shaped nuclei and sparse cytoplasm

12

Epithelia: Simple Squamous - Functions

1. Diffusion and filtration.
2. Provide a slick, friction-reducing lining in lymphatic and cardiovascular systems.

13

Epithelia: Simple Squamous - Locations

Present in the kidney glomeruli, lining of heart, blood vessels, lymphatic vessels, and serosae

14

Epithelia: Simple Cuboidal - Structure

Single layer of cube-like cells with large, spherical central nuclei.

15

Epithelia: Simple Cuboidal - Function

secretion and absorption

16

Epithelia: Simple Cuboidal - Location

Present in kidney tubules, ducts and secretory portions of small glands, and ovary surface.

17

Epithelia: Simple Columnar - Structure

Single layer of tall cells with oval nuclei; many contain cilia. Goblet cells are often found in this layer

18

Epithelia: Simple Columnar - Function

absorption and secretion

19

Epithelia: Simple Columnar - Location

1, Nonciliated type line digestive tract and gallbladder.
2, Ciliated type line small bronchi, uterine tubes, and some regions of the uterus

20

What to cilia do?

they help move substances through internal passageways

21

Epithelia: Pseudostratified Columnar - Structure

Single layer of cells with different heights; some do not reach the free surface. Nuclei are seen at different layers

22

Epithelia: Pseudostratified Columnar - Function

secretion and propulsion of mucus

23

Epithelia: Pseudostratified Columnar - Location

Present in the male sperm-carrying ducts (nonciliated) and trachea (ciliated)

24

Epithelia: Stratified Squamous - Structure

Thick membrane composed of several layers of flat-cells

25

Epithelia: Stratified Squamous - Function

protection of underlying areas subjected to abrasion

26

Epithelia: Stratified Squamous - Location

Forms the external part of the skin’s epidermis (keratinized cells),
and linings of the esophagus, mouth, and vagina (nonkeratinized cells).

27

Epithelia: Stratified Cuboidal - Structure

Typically two, cubed shaped cell layers thick

28

Epithelia: Stratified Cuboidal - Function

? Rare

29

Epithelia: Stratified Cuboidal - Location

some sweat and mammary glands

30

Epithelia: Stratified Columnar - how often

limited distribution in the body