Week 6 Quiz

In a cross-section of skin read from the surface down, which layer has no blood vessels of its own and is fed by diffusion from the layer beneath it?

Select one.

• The epidermis
• The dermis
• The reticular layer
• The hypodermis

Which list gives the epidermal strata in order from deep to superficial, as they appear in the thick skin of the palms and soles?

Select one.

• Corneum, lucidum, granulosum, spinosum, and then basale at the bottom
• Basale, granulosum, spinosum, lucidum, corneum
• Basale, spinosum, granulosum, lucidum, corneum
• Spinosum, basale, granulosum, corneum, lucidum

Thin skin has four epidermal strata. Why does the thick skin of the palms and soles have one more?

Select one.

• It adds a second stratum basale beneath the first
• It adds the stratum lucidum between the granulosum and the corneum
• It counts the dermis as an extra epidermal layer
• It adds the hypodermis on top of the corneum

Which pairing of epidermal cell, product, and job is correct?

Select one.

• Keratinocyte, melanin, pigment for the skin and a shield against UV light
• Melanocyte, keratin, toughness and water resistance
• Keratinocyte, sebum, lubrication of the hair
• Melanocyte, melanin, pigment and a shield against UV light

A structure in the dermis secretes an oily lipid mixture that lubricates and waterproofs skin and hair. Which structure is it?

Select one.

• An eccrine sweat gland
• A sebaceous gland
• An apocrine sweat gland
• The arrector pili

On an illustrative clinic chart with a set point of 37.0 °C and a model band of 36.5 to 37.5 °C, a reading of 38.5 °C appears. How far from the set point is it, and which skin effectors respond?

Select one.

• 1.5 °C below; the dermal arterioles constrict and goosebumps rise
• 1.0 °C above; the sebaceous glands release sebum to cool the skin
• 1.5 °C above; eccrine sweat evaporates and the dermal arterioles dilate
• 2.0 °C above; sweating warms the skin and the arterioles constrict

On the same illustrative chart, a reading of 36.0 °C sits 1.0 °C below the set point. Which set of skin responses opposes that change?

Select one.

• The dermal arterioles constrict, sweating stops, and the arrector pili raise goosebumps
• The dermal arterioles dilate and the eccrine sweat glands release more watery sweat onto the skin
• The sebaceous glands release sebum and the arterioles dilate
• No response, because the reading is inside the model band

True or false: the hypodermis is the deepest layer of the skin proper.

True or false.

• True
• False

Select every item that is a function of the integumentary system.

Select every option that applies.

• Synthesizing vitamin D under ultraviolet light
• Digesting food
• Sensing touch, surface temperature, and pain
• Supplying the body's ATP
• Helping regulate body temperature

After a bike fall, one scraped knee is white and stings but does not bleed, while the other beads with blood. What does the bleeding knee tell you about that scrape?

Select one.

• It stayed in the stratum corneum, where the vessels are
• It reached only the stratum basale of the epidermis
• It is wider, so it must be shallower than the other
• It reached the dermis, the layer that carries blood vessels