Ch. 15 Integumentary System (FINAL)

Question 1

The skin has two layers: the {…}, a superficial layer that consists mainly of a stratified squamous keratinized epithelium, and the {…}, a deeper layer of dense irregular connective tissue.

Answer 1

1) Epidermis
2) Dermis

Question 2

The epidermis is composed primarily of {…} (85%) that undergo differentiation to form stratified squamous keratinized epithelium.

Answer 2

Keratinocytes

Question 3

This layer of the epidermis is a single layer of small, mitotically active basal cells that are attached by hemidesmosomes to underlying connective tissue and by desmosomes to each other.

Answer 3

What is the stratum basale?

Question 4

This layer of the epidermis contains several layers of larger keratinocytes that are attached to each other by desmosomes located at the ends of their cytoplasmic processes containing intermediate filaments (keratin filaments).

Answer 4

What is the stratum spinosum?

Question 5

The stratum granulosum is a distinct layer of flattened keratinocytes filled with {…} granules (contain precursors to {…}, which aggregates {…} filaments) and lamellar bodies containing lipids, which, when secreted, are responsible for the formation of the epidermal {…} barrier.

Answer 5

1) Keratohyalin
2) Filaggrin
3) Keratin
4) Water

Question 6

The most superficial layer of the epidermis consisting of terminally differentiated squamous cells (with no nuclei) that are entirely filled with keratin filaments.

Answer 6

What is the stratum corneum?

Question 7

How long does total epidermal turnover take?

Answer 7

Approximately 47 days