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.

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)