Chapter 4 Tissue Flashcards

1
Q

Tissue

A

Collection of specialized cells that perform limited number of functions

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2
Q

Histology

A

the study of tissues

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3
Q

Four main types of tissue

A
  1. Epithelial tissue (covering, surfaces, linings, glands)
  2. Connective tissue (support fill space, structure, strength, transport, storage
  3. Muscle tissue ( movement)
  4. Nervous tissue (Control, transmit info)
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4
Q

Primary Germ layers

A

embryonic layers, give rise to all four tissue types in adult

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5
Q

Epithelial Tissue (2 categories)

A
  1. Epithelia- covering
  2. Glands- produce fluid secretions
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6
Q

Features of Epithelial Tissue

A
  1. Cellularity: little extracellular matrix mostly cells
  2. Contacts: cells linked by strong junctions
  3. Polarity: apical + basal surfaces, separate functions
  4. Attachment: attached to CT via basal lamina
  5. Avascularity: diffusion from CT
  6. Regeneration: high turnover, stem cells at basal surface
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7
Q

Functions of epithelial tissue

A
  1. Provide Physical protection
  2. Control permeability
  3. Provide sensation
  4. Produce specialized secretions
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8
Q

Structure of Epithelial tissue

A
  1. Apical Surface: exposed to environment may have: microvilli: absorption or secretion
    cilia: fluid movement
  2. Basolateral Surface: attachment to neighboring cells via intercellular connections
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9
Q

Basal lamina ( a.k.a basement membrane)

A
  1. Lamina lucida: from epithelia
    glycoproteins + fine filaments
    restrict large molecule movement
  2. Lamina densa: from CT
    coarse protein fibers
    provide strength
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10
Q

Squamous

A

flat, disc shaped nucleus

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11
Q

Cuboidal

A

Cube, center round nucleus

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12
Q

Columnar

A

tall, basal oval nucleus

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13
Q

simple

A

one cell layer

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14
Q

stratified

A

2 or more protection

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15
Q

Simple squamous epithelium

A

-thin, delicate
-in protected regions
-Locations:
-mesothelium
(serosa)
-endothelium
(blood vessels, heart)
-kidney tubules
-conjunctiva
-alveoli of lungs
-Functions:
absorption, diffusion, filtration or secretion

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16
Q

Stratified Squamous Epithelium

A

-basal cells look cuboidal, apical cells
squamous
-on exposed surfaces
-two types:
A. Nonkeratinized = mucosa
-kept moist
-all cells nucleated
Locations:
-mouth, esophagus
-anus
-vagina
B. Keratinized = epidermis
-dry, apical cells dead
-cells contain keratin protein
to resist dehydration
-Functions:
provide protection from abrasion,
pathogens, chemicals

17
Q

Simple Cubodial Epithelium

A

-Locations:
-kidney tubules
-pancreas
-salivary glands
-thyroid
-Functions:
-secretion or absorption

18
Q

Transitional Epithelium

A

-relaxed: looks like stratified cuboidal
-stretched: looks squamous
-Locations:
-urinary bladder
-ureters
-Function:
-tolerate excessive stretching

19
Q

Simple Columnar Epithelium

A

-nuclei line up near basal lamina
-apical surface of cells often has microvilli =
“brush border” (in intestine)
-goblet cells often present: secrete mucus
-Locations:
-stomach
-intestine
-gallbladder
-uterine tubes
-collecting ducts of kidney
-Functions:
-absorption or secretion

20
Q

Pseudostratified Columnar Epithelium

A

-several cell types:
varying shapes and functions
-all cells contact basal lamina
-some too short to reach apical surface
-nuclei scattered so it appears stratified
-tall cells have cilia on apical surface
-goblet cells (mucus) often present
-Locations:
-nasal cavity, trachea, bronchi
-male reproductive tract
-female uterine tubes
-Functions:
-move material across surface

21
Q

Stratified Columnar Epithelium

A

-rare
-two layers or multiple layers with only
apical layer columnar
-Locations (tiny parts of):
-pharynx, epiglottis
-anus
-mammary glands
-salivary glands
-urethra
-Functions
-minor protection

22
Q

Glandular Epithelium

A

for secretion makes up glands

23
Q

Endocrine glands

A

“internally secreting” secrete into interstitial flood, blood secretions= hormones

24
Q

Exocrine Glands

A

“externally secreting”
secrete into duct, epithelial surface
e.g. digestive enzymes, perspiration,
tears, milk, mucus
Classified three ways:
a. mode of secretion
b. type of secretion
c. structure

25
Q

Modes of secretion

A
  1. Merocrine secretion
  2. Apocrine secretion
  3. Holocrine secretion
26
Q

Merocrine secretion

A

-product released from
secretory vesicles
by exocytosis
e.g. mucus, sweat

27
Q

Apocrine secretion

A

-product accumulates in vesicles
-apical region of cell with vesicles is shed
to release product
e.g. milk

28
Q

Holocrine secretion

A

product accumulates in vesicles
-whole cell is lysed to release product
-cell dies, must be replaced by stem cells
e.g. sebum

29
Q

Type of secretion

A
  1. Serous glands: water + enzymes
    e.g. parotid salivary gland
  2. Mucus glands: mucin
    (+water = mucus)
    e.g. goblet cell
  3. Mixed exocrine glands:
    serous + mucus secretion
    e.g. submandibular salivary gland
30
Q

Gland Structure

A
  1. Unicellular Gland: 1 cell e.g goblet cell
  2. Multicellular gland: group of cells named for shape and structure
31
Q

Connective Tissue (CT) features

A

-never exposed to environment
-usually vascularized
-consists of cells in matrix

32
Q

Components of

A