UNIT 5 Flashcards
Freckles are elevated patches with an abnormal coloration of the skin.
True or False
False
The contraction of the arrector muscles in humans causes __________.
hairs to stand on end with no apparent function
Which of the skin layers below is the most superficial?
Epidermis
Which of the following are associated with the sense of touch?
Which of the following is not part of the skin?
Hypodermis
Leather is made of the __________ layer of the dermis.
reticular
Blood vessels in the __________ provide a hair with its sole source of nutrition.
dermal papilla
In whom are fully developed mammary glands found?
In lactating females
Mitosis in the __________ accounts for growth of the nail.
nail matrix
Which of the following cells stand guard against toxins, microbes, and other pathogens?
Dendritic cells
Merocrine sweat glands are associated with hair follicles in the pubic and anal regions, axilla, areola, and beard.
True or False
False
The “ABCD rule” for recognizing early signs of malignant melanoma refers to which of the following characteristics of the lesion?
Asymmetry, border irregularity, color, and diameter
Mammary glands are modified __________ glands that develop within the female breasts.
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
Ethnic differences in skin color are primarily caused by differences in ___________.
the quantity of melanin produced
Basal cell carcinoma initially affects cells of the stratum __________.
Basal
The base where a hair follicle originates in the skin is known as the __________.
hair bulb
Straight hair is round, wavy hair is oval, and curly hair is relatively flat.
True
Most of the skin is __________ mm thick.
1 to 2
Calluses or corns are the result of accelerated multiplication by ___________.
keratinocytes
Which of the following are associated with the sense of touch?
Tactile cells
The fastest rate of mitosis happens in the __________.
stratum basale
Each hair grows in an oblique epithelial tube called a __________.
hair follicle
__________ is/are formed partly from the secretions of glands in the external ear canal.
Cerumen
Which two strata of the epidermis are most susceptible to cancer?
Stratum spinosum and stratum basale
What type of hair is present prenatally and usually replaced by birth?
Downy (Lanugo)
Which layer is seen only in thick skin?
stratum lucidum
A pilus is a __________.
The hypodermis is characterized by an abundance of which tissue?
Adipose tissue
The oil of your scalp is secreted by __________ glands associated with the hair follicles.
sebaceous
Variations in hair color arise from differing amounts of __________.
eumelanin and pheomelanin
