4. Tissues & Histology

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.

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

(a) Connexons

(b) Gap junctions

(c) Desmosomes

(d) Tight junctions

Why are there no skin cancers that originate from stratum corneum cells?

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.

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

a. __

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?

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

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

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

b. ___

Which of the following epithelia most easily permits diffusion?

(a) Stratified squamous

(b) Simple squamous

(c) Transitional

(d) Simple columnar

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

In adults, over 90% of all cancers are either adenomas (adenocarcinomas) or carcinomas. In fact, cancers of the skin, lung, colon, breast, and prostate are all in these categories. Which one of the four basic tissue types gives rise to most cancers? Why do you think this is so?

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.

What are the four essential functions of epithelial tissue?