Anatomy & Phys Quiz 2

Which is the most logical reason for an elderly person's higher potential to be prone to skin infections, compared to a younger person?

Stem cell activity in the epidermis declines in the elderly

Which of the following conditions is the most common form of skin cancer?

basal cell carcinoma

Exposure of skin to ultraviolet light

can increase melanocyte activity

The function of the arrector pili is

contraction

When the arrector pili muscle is stimulated, it pulls on the hair follicle, causing __________.

goose bumps

Recall that exocrine glands secrete their products onto an epithelial surface (as you saw in Chapter 4: The Tissue Level of Organization). These secretions reach the surface either directly (mucous cells) or through tubular ducts that open onto the surface of the skin, or onto an epithelium lining, an internal passageway that connects to the exterior. Exocrine glands can be classified according to their mode of secretion, or type of secretion. Which type of exocrine secretion is characterized by the entire cell becoming packed with secretory vesicles and then bursting, releasing the secretion but killing the cell?

holocrine

Which of the following contains large quantities of adipose tissue, blood vessels, and nerve cells, but does not contain any vital organs?

Hypodermis

The following events are part of the skin repair process. In which order do they occur?

-inflammatory response -scab formation -phagocytosis of pathogens and debris -scar formation

Identify the order of layers that a piece of glass would puncture as it passes through the skin on the palm of the hand.

-stratum corneum -stratum lucidum -stratum granulosum -stratum spinosum -stratum basale -dermal papillae

What is the composition of the papillary layer of the dermis?

Areolar connective tissue

Identify the structures that are responsible for the stretching of the skin during pregnancy.

Elastic fibers are found in the reticular layer of the dermis

What is the function of melanin?

It protects DNA from the damaging effects of ultraviolet radiation.

The epidermal layer whose cells have stopped dividing and started to produce large amounts of keratin is the

stratum granulosum