Cell Bio Week 3

What is the primary function of epithelial tissue?

To transmit nerve impulses

To connect body structures

To support body structures

To cover and line surfaces of organs and the body

To cover and line surfaces of organs and the body

Which of the following is a characteristic feature of all epithelial tissue?

Presence of a large amount of extracellular matrix

Attachment to a basement membrane

Random cellular organization

High vascularization

Attachment to a basement membrane

Epithelial tissue is described as avascular, meaning

It is a major component of blood.

It has its own blood supply.

It does not have a blood supply. 

It can generate blood cells.

It does not have a blood supply. 

What term describes the side of the epithelial cell that faces the lumen?

Intermediate

Lateral

Basal

Apical

Apical

Epithelial cells exhibit polarity. What does this mean in the context of epithelial tissue?

The cells exhibit different structural and functional characteristics at their apical and basal surfaces.

The cells are capable of reversing their functions.

The cells are negatively charged on one end and positively charged on the other.

The cells can change polarity based on the pH of the environment.

The cells exhibit different structural and functional characteristics at their apical and basal surfaces.

What is the primary role of cilia found on certain epithelial cells?

To facilitate cell adhesion

To move substances along the surface of the cell

To absorb nutrients

To secrete substances

To move substances along the surface of the cell

What structural feature allows epithelial tissues to function as effective barriers and protective layers?

High degree of vascularization

Large intercellular spaces filled with extracellular matrix

Tight junctions between adjacent cells

Loose arrangement of cells

Tight junctions between adjacent cells

What defines an exocrine gland?

Glands that secrete hormones directly into the bloodstream.

Glands that secrete their products onto body surfaces or into cavities through ducts.

Glands that exclusively secrete enzymes.

Glands that do not have ducts and are not involved in secretion.

Glands that secrete their products onto body surfaces or into cavities through ducts.

What is a distinguishing feature of endocrine glands compared to exocrine glands?

Endocrine glands secrete products via ducts.

Endocrine glands are ductless and release their products into the bloodstream.

Endocrine glands are less specialized than exocrine glands.

Endocrine glands are always located near the surface of the body.

Endocrine glands are ductless and release their products into the bloodstream.

Which type of secretion involves the entire cell disintegrating to release its contents?

Holocrine

Merocrine

Apocrine

Endocrine

Holocrine

Which gland type is characterized by secretion via exocytosis?

Holocrine

Sebaceous

Apocrine

Merocrine

Merocrine

Which structure is NOT a component of a typical exocrine gland?

Duct system

Hormone synthesizing cells

Myoepithelial cells

Secretory acini

Hormone synthesizing cells

What describes the structure of a compound gland?

It has multiple branches in its duct system.

It only secretes hormones.

It has an unbranched duct system.

It does not have any ducts.

It has multiple branches in its duct system.

Which glands are involved in the secretion of the lipid layer of the tear film?

Endocrine glands

Goblet cells of the conjunctiva

Meibomian glands

Lacrimal glands

Meibomian glands

What produces the oily component of the tear film?

• A) Glands of Moll

• B) Lacrimal glands

• C) Goblet cells

• D) Glands of Krause

• E) Glands of Zeis

• E) Glands of Zeis

What is the retinal pigment epithelium composed of?

• A) Stratified columnar epithelium

• B) Simple squamous epithelium

• C) Simple cuboidal epithelium

• D) Stratified cuboidal epithelium

• E) Simple columnar epithelium

• C) Simple cuboidal epithelium

What type of gland is the Meibomian gland and what type of secretion does it do?

• A) Oil gland and merocrine

• B) Oil gland and holocrine

• C) Sweat gland and merocrine

• D) Sweat gland and apocrine

• E) Sweat gland and holocrine

• B) Oil gland and holocrine

Which protein is associated with tight junctions?

• A) Cadherins

• B) Concatins

• C) Connexins

• D) Claudin

• E) Cytokeratin

• D) Claudin

Which protein forms the gap junctions?

• A) Connexins

• B) Cadherins

• C) Fibrillins

• D) Catenins

• E) Concatins

• A) Connexins

What attaches to the hemidesmosomes?

• A) Microtubule

• B) Actin

• C) Myosin

• D) Intermediate filaments

• ) Intermediate filaments

What is the transition between bulbar and palpebral conjunctiva?

• A) Tarsal sulcus

• B) Palpebral fissure

• C) Fornix

• D) Ora serrata

• E) Limbus

• C) Fornix

Which type of tissue is the corneal epithelium?

• A) Stratified squamous non-keratinized epithelium

• B) Stratified cuboidal epithelium

• C) Simple columnar epithelium

• D) Pseudostratified columnar epithelium

• E) Simple squamous epithelium

• Stratified squamous non-keratinized epithelium

What type of tissue is the comeal endothellum?

A Simple cuboidal

1. Simple squamous

2. Stratified cuboidal

3. Stratified squamous

4. Denso regular

Simple squamous

Which of the following cytoskeletal components connect to desmosomes?

1. Microtubules

2. Intermediate filaments

3. Microfilaments

4. Actin

5. Connexins

1. Intermediate filaments

Which junctional component is connected to actin?

1. Tight junctions

2. Adhering junctions

3. Desmosomes

4. Hemidesmosomes

5. Gap junctions

1. Adhering junctions

How is the lacrimal gland classified?

1. Simple tubular

2. Compound tubular

3. Simple acinar

4. Compound tubuloacinar

1. Compound tubuloacinar

How are sweat glands classified?

1. Compound coiled tubular

2. Simple coiled tubular

3. Simple unbranced tubular

4. Simple branched tubular

1. Simple coiled tubular

Which of the following is true of Glands of Zeis (choose all that are correct)?

1. They are sudoriferous glands

2. They are sebaceous glands

3. They are endocrine glands

4. They are exocrine glands

5. They are located in the tarsal plate

1. They are sebaceous glands

1. They are exocrine glands

Which comprises the outermost layer of the tear film?

1. Water

2. Mucin

3. Lipid

1. Lipid

Which tissue comprises the epidermis?

1. Stratified squamous non-keratinized epithelium

2. Stratified cuboidal epithelium

c. Stratified squamous keratinized epithelium A

D. Dense regular connective tissue

c. Stratified squamous keratinized epithelium A