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Vitamin D3 formed within the skin has all of these effects on other organ systems except that it


A) is essential for absorption of calcium and phosphorus by the digestive system.
B) functions as a precursor for the hormone calcitriol in the endocrine system.
C) is essential for bone maintenance.
D) functions in the activation of plasma cells by the lymphatic system.
E) is essential for bone growth.

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A new mother notices that her 6-month-old infant has a yellow-orange complexion.Fearful that the child may have jaundice,she takes him to her pediatrician.After examining the child and learning about the infant's diet,the pediatrician declares him perfectly healthy and advises the mother to watch the child's diet.What is likely the cause for the change in skin color?

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The infant probably has a fondness for v...

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A 32-year-old woman is admitted to the hospital with third-degree burns on her entire right leg,entire right arm,and the back of her trunk.Estimate the percentage of her body surface area affected by these burns.


A) 9%
B) 18%
C) 36%
D) 45%
E) 91%

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________ is a small connective tissue peg that contains nerve endings and blood vessels.


A) Hair medulla
B) Hair bulb
C) Hair papilla
D) Hair matrix
E) Hair cuticle

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The two components of the integumentary system are the


A) epidermis and dermis.
B) cutaneous membrane and hypodermis.
C) cutaneous membrane and accessory structures.
D) integument and hypodermis.
E) epidermis and superficial fascia.

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Which of the following is a holocrine exocrine gland?


A) sebaceous
B) apocrine
C) merocrine
D) mammary
E) ceruminous

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The combination of fibrin clot,fibroblasts,and extensive capillary network that is formed in injured skin is called


A) a scab.
B) a keloid.
C) granulation tissue.
D) a clot.
E) a lesion.

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________ sweat glands are widely distributed across the body surface,________ glands are located wherever hair follicles exist,and ________ sweat glands are found only in a few areas.


A) Sebaceous; merocrine; apocrine
B) Apocrine; merocrine; sebaceous
C) Merocrine; sebaceous; apocrine
D) Merocrine; apocrine; sebaceous
E) Apocrine; sebaceous; merocrine

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Why does exposure to sunlight or sunlamps darken skin?


A) UV radiation stimulates melanocytes to produce more melanin.
B) UV radiation stimulates melanocytes to produce more melatonin.
C) UV radiation stimulates keratinocytes to produce more carotene.
D) UV radiation stimulates keratinocytes to produce more keratin.
E) UV radiation stimulates melanocytes to produce more melanin and keratinocytes to produce more keratin.

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Scar tissue is the result of


A) large numbers of collagen fibers and relatively few blood vessels in the injured area.
B) increased numbers of epidermal layers in the area of the injury.
C) a thickened stratum basale in the area of the injury.
D) increased numbers of fibroblasts in the injured area.
E) a lack of sebaceous glands in the injured area.

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What is the survival rate of a localized malignant melanoma that is detected and removed in the early stages of the cancer?


A) Above 95%
B) 75%
C) 60%
D) 40%
E) less than 20%

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Where does nail production occur?


A) At the lunula
B) At the cuticle
C) At the eponychium
D) At the hyponychium
E) At the nail root

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The nail body covers the


A) nail root.
B) nail bed.
C) lunula.
D) free edge.
E) hyponychium.

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Epidermal growth factor exerts all of the following effects on the epidermis except


A) promoting cell division.
B) stimulating keratin synthesis.
C) accelerating tissue repair.
D) speeding up glandular function.
E) stimulating melanin production.

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All of the following are correct regarding hair growth cycle except that


A) a hair in the scalp grows for 2 - 5 years.
B) a healthy adult with full head of hair may lose up to 100 hairs each day.
C) during the active phase,the hair grows continuously.
D) club hair is shed during follicle reactivation.
E) the hair becomes club hair during regression phase.

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Why is a subcutaneous injection with a hypodermic needle a useful method of administering drugs?

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The subcutaneous layer has a l...

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Describe the secretory method and functions of sebum.


A) merocrine; sebum lubricates hair and skin,protects the keratin of the hair shaft,and inhibits bacterial growth
B) holocrine; sebum lubricates hair and skin,protects the keratin of the hair shaft,and inhibits bacterial growth
C) apocrine; sebum lubricates hair and skin,protects the keratin of the hair shaft,and inhibits bacterial growth
D) merocrine; sebum is important in thermoregulation and excretion of wastes
E) endocrine; sebum is important in thermoregulation and excretion of wastes

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Which exocrine glands are in the integument?


A) Sweat glands and salivary glands
B) Mammary glands and salivary glands
C) Sweat glands and sebaceous glands
D) Mucous glands and sebaceous glands
E) Mucous glands and sweat glands

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A fibrin clot that is formed over a skin wound is called


A) a scab.
B) a keloid.
C) granulation tissue.
D) a clot.
E) a lesion.

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The epidermis in the thin skin contains ________ layer(s) and in the thick skin contains ________ layers.


A) 1; 2
B) 2; 3
C) 3; 4
D) 4; 5
E) 5; 6

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