Lecture 12: Epithelial Tissue Flashcards Preview

Year 1: 03. MSK Exam 1 > Lecture 12: Epithelial Tissue > Flashcards

Flashcards in Lecture 12: Epithelial Tissue Deck (29)
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1

Regular Cell

1. What are the properties of the apical surface?

2. What are the properties of the basal​ surface?

3. What are the properties of the lateral​ surface?

1. What are the properties of the apical surface?

Faces exterior surface/lumen and participates in molecular filtering

2. What are the properties of the basal​ surface?

Rests on basement membrane and anchors cell to underlying connetctive tissue

3. What are the properties of the lateral​ surface?

Communicates and attaches to adjacent cells while maintaining integrity

2

Tight/Occluding Junctions

1. What are their properties?

2. Where do you normally find them?

1. What are their properties?

They are impermeable and acts as a barrier

2. Where do you normally find them?

Normally at apical surface

3

Gap/Communication Junctions

1. What are their properties?

2. Where do you normally find them?

1. What are their properties?

-Mediate communication with adjacent cells

-Uses Connexin to create a pore for fluid and ions to pass through

2. Where do you normally find them?

Lateral Side of Cells

4

Anchoring Junctions

1. What is the function?

2. What types of anchoring junctions are there?

1. What is the function?

Link a cell to the cytoskeleton of adjacent cells 

2. What types of anchoring junctions are there?

Adherins: Cadherins that interact with actin filaments on the apical surface

Desmosomes: Cadherins that interact with intermediate filaments on the lateral surface

Hemidesomosomes: Basal adhesions that interact with integrins and intermediate filaments that anchor to basal lamina

 

5

What is the basement membrane?

Extracellular material where basal surface of cell rests on

-Permits diffusion of nutrients

6

What are the three types of Apical Specializations?

1. Microvilli

2. Stereocilia

3. Cilia

 

7

Microvilli

What is their function?

What makes up the core of each Microvillus?

Function: Specialized for Absorption

Composition: Actin core

8

Stereocilia

1. What is its function?

2. What is its composition?

3. Where is it found?

Function: Absorption and Secretion

Composition: Acting core and longer than usual microvilli (has less movement)

Location: Epididymis and the Sensory Cells of the Inner Ear

9

Cilia

1. What is its function?

2. What is its composition?

3. Where is it found?

Function: Propel substances across tissue (to remove debris) and plays role in embryonic L/R axis determination

Composition: Internal arrays of microtubules (axoneme)

Location: Respiratory Tract 

10

What are the three types of Cilia and their functions?

Motile: Beat in a wave like fashion to move substances

Primary: Immobile, but function as chemo-/osmo-/mechano- sensors

Nodal: Embryonic, help determine left/right axis

11

Where might you find Simple Squamous Epithelium?

Lining the Blood and Lymph Vessels (Endothelium)

Lining of Serous Membranes (Mesothelium)

-reduce friction

Lining Alveoli, Loop of Henle, Ducts

12

Where might you find Simple Cuboidal Epithelium?

Kidney Tubules, Glands, and Associated Ducts.

Terminal Bronchioles

Covering of the Ovary

13

Where might you find Simple Columnar Epithelium?

Auditory Tubes

Uterus

Oviducts

Stomach

Small / Large Intestines

Gallbladder

14

Where might you find Pseudostratified Columnar Ciliated Epithelium?

Lining of the Nasal Cavity

Pharynx

Trachea

Bronchi

(Respiratory System except the Terminal Bronchioles)

Looks like many layers but it is just one

15

Where might you find Urothelium?

Urinary Bladder

Ureters

Urethra

Multiple layers but doesn't follow 3 shape rule

16

What is the special function of the Urothelium?

It is distensible

17

Where might you find Nonkeratinized Stratified Squamous Epithelium?

Oral Cavity

Portions of the Pharynx

Esophagus

Anus

Vagina

Urethra

Cornea

Apical cells have nuclei!

18

What is special about the Apical Layer of Keratinized Stratified Squamous Epithelium?

The cells there do not have Nuclei

19

Where might you find Stratified Cuboidal Epithelium?

Sweat Glands and Ducts

Ovarian Follicles

Salivary Gland Ducts

Release Products and very similar looking to Stratified Columnar

20

What function does a Goblet Cell perform?

Secretes mucus into the GI tract.

Simple Columnar Cells

21

What kind of membranes are the Peritoneum, Pericardium, and Pleura?

Serous Membranes (Mesothelium)

22

What is the example given for a Unicellular Gland?

Goblet Cell

23

What is the method of secretion for a Merocrine Gland?

Secretory products are wrapped in membrane bound vesicles to the apical surface and released via exocytosis.

Example: Salivary Gland

24

What is the method of secretion for an Holocrine gland?

Secretory product builds up inside of a cell, causing apoptosis

Cell ruptures and releases product along with cell debris

Example: Sebaceous Gland

25

What is the method of secretion for an Apocrine gland?

Secretory product released with the apical portion of cell

-Secretory product is surrounded by cytoplasm within the plasma membrane 

Example: Mammary Glands

26

What is the secretory portion of a multicellular gland called?

The Acinus

In Exocrine Glands

27

What sort of secretions are formed in the Parotid Gland?

Serous

28

What sort of secretions are formed in the Sublingual Gland?

Mucous

29

What kind of secretions are formed in the Submandibular Gland?

Both Serous and Mucous