chapter 6 Flashcards
A ________ is an elevated patch of melanized skin.
mole
A hair cycle consists of three developmental stages in which order?
Anagen, catagen, and telogen
A pilus is a ________.
hair
Blood vessels in the ________ provide a hair with its sole source of nutrition.
dermal papilla
Calluses or corns are the result of accelerated multiplication by ________.
keratinocytes
Each hair grows in an oblique epithelial tube called a(an) ________.
hair follicle
Ethnic differences in skin color are primarily caused by differences in ________.
the quantity of melanin produced
Excessive hairiness is called ________.
hirsutism
Fingerprints left on things we touch are associated with our ________.
dermal papillae
In which of the following skin layers would a subcutaneous injection be administered?
hypodermis
Increased bilirubin levels cause a skin discoloration called ________.
jaundice
Leather is made of the ________ layer of the dermis.
reticular
Looking at a slide of axillary skin under the microscope, you notice the presence of ________ glands that are absent on slides of the scalp.
apocrine
Looking at a slide of thin skin under the microscope, you note that the stratum basale is the ________ layer of the epidermis in from the surface.
fourth
Mammary glands are modified ________ glands that develop within the female breasts.
apocrine
Mitosis in the ________ accounts for growth of the nail.
nail matrix
Most of the skin is ________ mm thick.
1 to 2
Secretions from ________ glands contribute to the acid mantle that inhibits bacterial growth on the skin.
merocrine sweat
Skin covering the ________ has sweat glands but no hair follicles or sebaceous glands.
fingertips
The “ABCD rule” for recognizing early signs of malignant melanoma refers to the following characteristics of the lesion:
asymmetry, border irregularity, color, and diameter
The ________ glands are a source of sex pheromones.
apocrine
The ________ is absent from most epidermis.
stratum lucidum
The base where a hair follicle originates in the skin is known as the ________.
hair bulb
The contraction of the piloerector muscles (pilomotor muscle or arrector pili) in humans causes ________.
hairs to stand on end with no apparent function
The fastest rate of mitosis happens in the ________.
stratum basale
The hypodermis is characterized by an abundance of which tissue?
adipose tissue
The least common, but most deadly, type of skin cancer is ________.
melanoma
The narrow zone of dead skin overhanging the proximal end of a nail is called the ________.
eponychium
The oil of your scalp is secreted by ________ glands associated with the hair follicles.
sebaceous
The reddish color of the skin of the lips is primarily due to the presence of which pigment?
Hemoglobin
The skin discoloration most likely to suggest physical abuse is ________.
hematoma
Variations in hair color arise from differing amounts of ________.
eumelanin and pheomelanin
What is the white opaque “moon” often found at the proximal end of a fingernail called?
lunule
What type of hair is present prenatally and usually replaced by birth?
lanugo
What type of tissue is found in the most superficial layer of skin?
Stratified squamous epithelium
Which cutaneous glands are concerned with cooling the body?
Merocrine glands
Which layer of the epidermis consists of up to 30 layers of dead cells?
Stratum corneum
Which of the following are associated with the sense of touch?
Tactile (Merkel) cells
Which of the following best describes the composition of the dermis?
Collagen and fibroblasts
Which of the following cells is largely responsible for skin color?
Melanocyte
Which of the following cells stand guard against toxins, microbes and other pathogens?
Dendritic (Langerhans) cells
Which of the following is not found in the epidermis?
fibroblasts
Which of the following is not part of the skin?
hypodermis
Which of the skin layers below is the most superficial?
epidermis
Which skin color is most likely to result from anemia?
pallor
Which two strata of the epidermis are most susceptible to cancer?
Stratum spinosum and stratum basale
________ is/are formed partly from the secretions of glands in the external ear canal.
Cerumen
