Deck 5 (MR): The Integumentary System

Question 1

Which of the following statements are true of vitamin D (Select all that apply)?

A)The stimulus for cutaneous production of vitamin D is the ultraviolet rays of the sun.
B)Cutaneous vitamin D is made from phospholipids stored in the skin.
C)Vitamin D promotes the absorption of calcium by the liver.
D)Vitamin D contributes to efficient immune responses.

Answer 1

A,D

Question 2

Which of the following statements are true of human hair and nails (Select all that apply)?

A)Hair on the scalp provides thermal insulation.
B)A fingernail is made of a very strong form of collagen.
C)Each hair has a small muscle that flattens the hair to protect the skin from cold.
D)Nails protect the proximal ends of the fingers and toes from mechanical injury.
E)Eyelashes help keep dust out of the eyes.
F)Fingernails are useful for picking up small objects.
G)Hairs in the upper nasal cavities protect the nasal sinuses.
H)A nail root or hair root is a site of mitosis.

Answer 2

A,E,F,H

Question 3

Which of the following statements are true of melanocytes and melanin (Select all that apply)?

A)Melanocytes are found in the dermis,where they are protected from mechanical injury.
B)Melanin gives color to the eyes as well as to the skin.
C)Melanin protects living cells from the heat of direct sunlight.
D)Skin color is a genetic characteristic,and color darkens when the skin is exposed to infrared light.
E)The more melanocytes per square inch of skin,the darker a person's skin color.
F)A melanocyte that becomes malignant may give rise to a melanoma.

Answer 3

B,F

Question 4

Which of the following statements are true of sweating (Select all that apply)?

A)Sweating is most efficient when the humidity is high.
B)Sweating is an effective means of heat loss because water has a high heat of vaporization.
C)Sweat is produced by eccrine glands,which are most numerous on the trunk of the body.
D)Excess body heat evaporates sweat through the epidermis.
E)Sweat glands are unicellular glands that respond to environmental temperature changes.
F)Excessive sweating may lead to dehydration.

Question 5

Which of the following statements are true of the glands of the skin (Select all that apply)?

A)Sebum prevents drying of the skin.
B)Ceruminous glands open into hair follicles in the axillae.
C)The secretion of apocrine glands has an individual scent.
D)Cerumen lubricates movement across the skin.
E)Sebaceous glands open into hair follicles,especially in the face.f.Apocrine glands become more active in stressful situations.

Question 6

Which of the following statements are true of the cutaneous senses (Select all that apply)?

A)Most of the receptors are in the dermis and subcutaneous tissue.
B)The more receptors per square inch,the more sensitive the skin is.
C)Free nerve endings are only for pain.
D)Receptors for pressure and itch are encapsulated nerve endings.
E)These senses provide information about the external environment.
F)Receptors are most numerous in the skin of the palms and soles.

Question 7

Which of the following statements are true of the arterioles in the dermis (Select all that apply)?

A)Arterioles are able to constrict because of the smooth muscle in their walls.
B)In a cold environment,arterioles will constrict to bring heat to the surface to keep the skin warm.
C)In a warm environment,arterioles will dilate to keep blood and excess heat away from the skin surface.
D)In a stressful situation,arterioles will dilate to bring more blood with oxygen to the skin.

Question 8

Which of the following statements are true of the epidermis (Select all that apply)?

A)The entire epidermis is made of dead cells and is a very good barrier to pathogens.
B)Langerhans cells produce antibodies to foreign material.
C)Mitosis takes place in the stratum germinativum,the outermost layer.
D)Merkel cells are receptors for the sensation of pain
E)Most of the epidermal cells are keratinocytes.
F)The stratum corneum is made of keratin and collagen.
G)Keratin is resistant to chemicals such as acids.
H)Flaking of cells from the skin surface helps remove bacteria.

Question 9

Which of the following statements are true of the layers of the skin (Select all that apply)?

A)The dermis contains fibrous connective tissue,which provides waterproofing for the skin.
B)The epidermis is made of stratified columnar epithelium.
C)The subcutaneous tissue is directly external to the dermis.
D)The dermis contains elastic connective tissue that provides recoil when the skin is stretched.
E)The papillary layer of the dermis contains capillaries to nourish the stratum corneum.
F)The epidermis is thickest on the palms and soles.

Question 10

Which of the following statements are true of the superficial fascia (Select all that apply)?

A)Adipose tissue has potential energy in the form of fat.
B)Areolar connective tissue contains many white blood cells.
C)This layer is a secondary line of defense for the body because it is just within the skin.
D)The mast cells in this layer produce histamine,which contributes to inflammation.

Question 11

Which of the following statements are true of the integumentary system (Select all that apply)?

A)Functions of the system include immune responses and vitamin E production.
B)An important function is to separate the internal environment from the external environment.
C)Temperature regulation involves the arterioles of the epidermis.
D)The entire dermis is living tissue.
E)The skin is an organ,because it is made of different kinds of tissues.
F)Subcutaneous tissue is between the epidermis and the muscles.