4. Tissues & Histology

Identify the six types of epithelial tissue shown in the drawing below.

c. ___

The most abundant connections between cells in the superficial layers of the skin are

(a) Connexons

(b) Gap junctions

(c) Desmosomes

(d) Tight junctions

Most cancers develop in epithelial tissues. Which epithelial tissue characteristic makes them prone to cancer?

Together the basal lamina and the reticular lamina make up the _____________________. The basal lamina is produced by the _________________, while the reticular lamina is produced by the ____________________.

A student scratched herself accidentally. What piece of evidence would suggest the scratch went through the epithelium (outermost layers of her skin) and reached the underlying connective tissue?

The epithelial tissue in the small intestine is specialized to absorb nutrients. Why would tight junctions be important in this function?

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Epithelial tissues are classified by cell shape and the number of cell layers.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Epithelial tissues function in protection, immune defenses, secretion, transport, and sensation.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Epithelial tissue is highly vascular.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Keratinocytes begin life in the stratum corneum and gradually are pushed into the stratum basale.

Imagine that a disease turns the simple epithelia of the lungs, kidney tubules, and intestines into keratinized stratified squamous epithelia. What effect would this change in form have on the functions of these tissues?

Describe the roles of the following components of the ECM:

Glycoproteins (cell-adhesion molecules)

In which of the following tissue types might you expect to find goblet cells?

a. Simple cuboidal

b. Simple columnar

c. Simple squamous

d. Stratified squamous

e. Transitional

Which epithelium is 'built' to withstand friction?

a. Simple squamous

b. Stratified squamous

c. Simple cuboidal

d. Simple columnar

e. Pseudostratified

Describe the general characteristics of epithelial tissue. List the most important functions of epithelial tissues, and give examples of each.