Complete the following chart and then circle the layer that

Complete the following chart, and then circle the layer that is found beneath the skin. How do the cells of stratum corneum and stratum basale differ? ____ State the specific location of melanin observed in dark skin ____ Which is darker, the anterior forearm or the posterior forearm ____ Explain why ____ What special qualities, due to the presence of fibers, does the connective tissue of the dermis have? ___How is the structure of the thick skin of the palms of the hands and soles of the feet properly suited for its function? ____

Solution

1. ANS:

A. Epidermis

Location: outermost layer of the skin

Tissues: Epithelial tissue

Characteristics: It is a protective waterproof barrier that also keeps pathogens at bay and regulates body temperature

B. Dermis:

Location: Middle layer present in beneath the epidermis of the skin

Tissues: Connective tissue

Characteristics: It is a thick layer of fibrous and elastic tissue (made mostly of collagen, elastin, and fibrillin) that gives the skin its flexibility and strength.

C. Hypo dermis:

Location: Deeper subcutaneous tissue layer of the skin

Tissues: Fat and connective tissue

Characteristics: It maintains the body temperature.

2. ANS:

Stratum corneum and stratum basale difference:

The cells of stratum basale are cuboidal to columnar and the stratum corneum cells are made with keratin.

3. ANS:

In the location of stratum basale, melanin content specifically observed in dark (heavily pigmented) skin.

4. ANS:

The dorsal side (posterior) of the forearm is the \"top\" side-- the side that usually faces upward and is generally darker than anterioir side. It is mainly due to melanin and hair follicles.

5. ANS:

The special qualities of dermis connective tissue can contains with Collagenous fibers, elastic fibers, and a gel-like substance.

6. ANS:

The sole of feet and the palms of hands are structured to perform day to day functions. The hardness on the skin on these locations is due to the layers of epidermis that contain dead keratinocytes are the Stratum corneum and stratum lucidum

Stratum lucidum: Thin, clear layer present in the thick skin of the palms and soles; no remaining living cells.

Stratum corneum: Several layers of keratinized corneum; a collagenous matrix composed of the products of dead cells. Keratin and the thickened plasma membrane protect the skin against abrasion and penetration, and the glycolipid between its cells nearly waterproofs this layer.