4) Epithelial Cells & Surface Specialisations Flashcards Preview

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Flashcards in 4) Epithelial Cells & Surface Specialisations Deck (21)
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1
Q

What is the structure of a mucosal membrane?

A

Epithelium lining the lumen of a tube
Lamina propria
Muscularis mucosa

2
Q

What is the function of simple squamous epithelia?

A

fast material exchange

Barrier to fluids

3
Q

What are simple cuboidal epithelia?

A

Single layer of epithelail cells whose length and width are similar

4
Q

Where are simple cuboidal epithelia located?

A

Thyroid
Pancreatic duct
Collecting ducts of the kidney

5
Q

What are the functions of simple cuboidal cells?

A

Secretion and absorption
Barrier
Hormone synthesis, storage and mobilisation

6
Q

Describe the structure of simple columnar cells

A

Height is significantly bigger than its width

Nucleus near basal laminar

7
Q

Where are simple columnar cells located?

A

GI tract

8
Q

What are the main functions of simple columnar epithelia?

A

Absorption
Secretion
Lubrication

9
Q

What are pseudostratified epithelia?

A

All cells make contact with the basement membrane and the epithelial cell surface
Nuclei at different levels

10
Q

Where are pseudostratified epithelia located?

A

Line of the nasal cavity, trachea and bronchi

11
Q

What is the function of pseudostratified epithelia?

A

Absorption and conduit
Mucus secretion
Partical trapping anf removal

12
Q

Where are non-keratinised stratified squamous epithelial cells located?

A

anywhere where there is an opening to the outside world

13
Q

What is the role of non-keratinised stratified squamous epithelia?

A

Portection from abraision

Reduced water loss but remains moist

14
Q

How does psoriasis occur?

A

the transit time between the basal layer and stratum corneum is 2-4 days, so there is no time for the stratum corneum to mature, so silvery scaley skin

15
Q

What is the function of melanocytes?

A

To produce melanin

amount of melanin put into epidermal layer dtermines skin tone

16
Q

What is the function of langerhans cells?

A

To act like antigen presenting cells

17
Q

Where are stratified squamous epithelial cells found?

A

Surface of the skin

18
Q

What is the function of stratified squamous keratinised epithelium?

A

Protect against abraisons
prevent water loss
shield against UV light damage

19
Q

Where are transitional epithelial cells found?

A

Urinary tract

20
Q

What is acute bronchitis?

A

Cough and mucus production, breathlessness

Less than 3 months

21
Q

What is chronic bronchitis?

A

Chronic inflammation of the bronchi and bronchioles, causing a cough and mucus productions for 2 or more episodes lasting more than 3 months within 2 years