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(Answered) Human Anatomy and Physiology 1 Homework 11

Bio 201

Question 1

Match a skin function with each description or component.

Keratinocytes exposed to UV light carry out chemical reactions.

Keratinocytes produce a lot of keratin in the thick epidermis.

Dermal blood vessels can vasoconstrict or vasodilate to help with this.

Merkel cells and Pacinian corpuscles are found in skin.    sensation
Melanin tends to be positioned like an umbrella over the nucleus of basal cells.

All Answer Choices
A. sensation
B. vitamin D synthesis
C. protection
D. thermoregulation

Question 2

Match the type of heat loss with its description.

Transferring heat to other objects (like clothes).  conduction
Transferring heat to make water vapor that moves into the air.

The most common method of heat loss.

Infrared waves emanating off the body.

The fact that warm air always rises.

All Answer Choices
A. conduction
B. evaporation
C. radiation
D. convection

Question 3

Match the type of skin cancer with its description.

The form of skin cancer that tends to make dark, irregular spots on skin and is quite deadly.

The most common type of skin cancer, but with the best prognosis.  basal cell carcinoma
A very rare form of skin cancer, but one that is extremely dangerous (twice as lethal as the most dangerous type described in your textbook).

The tumors from this type of skin cancer originate in stratum spinosum.

All Answer Choices
A. basal cell carcinoma
B. squamous cell carcinoma
C. melanoma
D. Merkel cell carcinoma

Question 4

What three items in this list are needed to produce vitamin D?  UV rays

Answer Choices

dendritic cells (a.k.a. Langherhans cells)

UV rays

Question 5

The least harmful type of skin burn is a 1st degree burn, while the most harmful is a [2] burn. After a burn, both the epidermis and the dermis have to regrow and heal, but it is the epidermis that is needed to heal to regain the protective function of skin and prevent infection.

When the skin is burned so that some, but not all, of the dermis is destroyed, that is a [4] burn. In this case, it is the [5] (which cells?) that have to divide to regain protection.

When all of the dermis is destroyed, but the underlying hypodermis is mostly intact, that is a [6] burn. Only a skin graft can repair a large section of skin that has this type of burn.

When only some of the epidermis is damaged, that is a [7] burn and can simply be repaired from the remaining [8] (which cells?).

All Answer Choices

1st degree
2nd degree
3rd degree
4th degree
accessory organ cells
basal cells

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