The human integumentary system includes:

• skin, nails, hair follicles, and glands

• just the skin

• the epidermis, dermis, and subcutaneous layer

• muscles and bones

As cells are pushed from the deeper part of the epidermis toward the surface...

• They divide continually

• Their supply of nutrients improves

• They die

• They become dermal cells

The skin...

• Retards water loss from deeper tissue

• Excretes waste

• Regulates body temperature

• Synthesizes vitamin D

• All of these

Epidermal cells are supplied with nutrients from blood vessels located in the

• Epidermis

• Epidermis and Dermis

• Dermis

• Subcutaneous layer

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The main function of melanocytes is to

• Remove dead cells by Phagocytosis

• Help control body temperature

• Produce melanin

• Produce vitamin D

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Cutaneous carcinomas are most commonly caused by exposure to

• X rays

• Gamma radiation

• Ultraviolet Light

• Carcinogenic chemicals

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Exposure to ultraviolet light darkens the skin by stimulating production of

• Melatonin

• Carotene

• Hemoglobin

• Melanin

The shaft of a hair is composed of

• Dead epidermal cells

• Living epidermal cells

• Dead dermal cells

• Living dermal cells

Which of the following is a normal response to excess loss of body heat in a cold environment?

• Dermal blood vessels constrict

• Sweat glands become inactive

• Skeletal muscles contract involuntarily

• All of these

Keratinocytes...

• Produce skin pigments in cell organelles called melanosomes

• Are found in both the dermal and the epidermal layers of the skin

• Are specials cells of the immune system

• Are responsible for the permeability characteristics of the epidermis.