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Epithelia > Epithelia > Flashcards

Epithelia Flashcards

1
Q

Epithelia are ________ meaning they depend on diffusion of nutrients from capillaries in the underlying connective tissue or from a moist free surface.

A

avascular

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2
Q

What are epithelia innervated by?

A

sensory neurons

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3
Q

What are the two surfaces that the layer(s) of epithelia attaches that form a flat sheet?

A

free surface and basal surface

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4
Q

Which surface is exposed to the environment or an internal body cavity?

A

free surface

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5
Q

Which surface is attached to a basement membrane?

A

basal membrane

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6
Q

What is the layer of collagen and adhesive proteins that anchors epithelium to underlying connective tissue? Is it permeable or semi-permeable?

A

basement membrane; semi-permeable

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7
Q

What two laminas is the basement membrane composed of?

A

basal lamina and reticular lamina

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8
Q

The _____ ______ is a complex mixture of proteins produced by epithelial cells and underlying fibroblasts

A

basal lamina

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9
Q

What are the 3 things the basal epithelial cells contributes to the basal lamina?

A

laminin, entactin, type IV collagen

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10
Q

________ in connective tissue under epithelia contribute molecules including _________ and __________ to the basal lamina.

A

Fibroblasts; fibronectin; proteoglycans

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11
Q

The _________ ______ is composed of a network of long straight collagen fiber and branched reticular fibers under the basal lamina.

A

reticular lamina

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12
Q

What underlying connective tissue does the reticular lamina blend into?

A

lamina propria

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13
Q

The _____ ______ is composed of a thin, light staining ______ ______ and a darker staining ______ _____.

A

basal lamina; lamina lucida; lamina densa

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14
Q

What is the electron-lucent layer above the lamina densa that contains extrecellular portions of cell adhesion molecules from the integrin family of transmembrance proteins including laminin, entactin, and fibronectin?

A

lamina lucida

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15
Q

_______ is a glycoprotein secreted by epithelial cells that bind Type IV collagen, heparin sulfate and integrins.

A

Laminin

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16
Q

_______ is the glycoprotein that bridges the lamina lucida and lamina densa to the plasma membrane.

A

Laminin

17
Q

What is lamina densa composed of?

A

type IV collagen and proteoglycans

18
Q

The basal lamina and the reticular lamina are joined together by type ___ and type ___ collagen fibrils that weave through the loops of type ___ collagen anchoring fibrils.

A

I; III; VII

19
Q

______________ connect the basal lamina to the cytoskeletal tonofilaments.

A

Hemidesmosomes

20
Q

What are the functions of simple squamous epithelium?

A

allow rapid diffusion of gases and can secrete fluids (serous fluid)

21
Q

Where are some examples of where simple squamous epithelium are found?

A

lining of alveoli of lungs, renal glomeruli, cardiovascular system (heart and blood vessels); membranes covering body cavities and organs

22
Q

What are the functions of simple cuboidal epithelium?

A

absorption, secretion, conduction

23
Q

Where are simple cuboidal epithelium found?

A

liver, thyroid, lung bronchioles, kidney tubules, mammary glands, salivary glands, and other glands

24
Q

What kind of epithelium is a single row of cube-shaped cells, often with microvilli?

A

simple cuboidal epithelium

25
Q

What kind of epithelium is a single row of tall, narrow cells?

A

simple columnar epithelium

26
Q

What kind of epithelium is a single row of flat cells?

A

simple squamous epithelium

27
Q

What are the functions of simple columnar epithelium?

A

absorption, secretion (of mucus)

28
Q

Where are simple columnar epithelium found?

A

intestines, uterus, ducts of glands

29
Q

What kind of epithelium is a single row of a mix of short basal cells and taller goblet cells which creates a stratified appearance all attached to the basement membrane?

A

pseudostratified epithelium

30
Q

What are the functions of pseudostratified epithelium?

A

secretes and propels respiratory mucus

31
Q

Where are simple columnar epithelium found?

A

Found in upper respiratory tract including trachea and nasal cavities.

32
Q

_____ membranes consists of a mucous-producing __________, and underlying layer of vascular connective tissue called ______ _______ and a thin layer of smooth muscle called __________ _______.

A

Mucous; epithelium; lamina propria, muscularis mucosae

33
Q

Mucous membranes line passageways that open to the exterior: _________ tract, ___________ tract, _______ tract, and the ____________ tracts.

A

digestive, respiratory, urinary, and reproductive

Epithelia (1 decks)

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