MASTERING
What is true about both the epidermis and the dermis?
Sensory receptors are present in each
What is true about apocrine sweat glands?
They are located predominantly in axillary and genital areas.
primarily found in the genital and axillary areas
apocrine glands
Skin color is determined by the degree of oxygenation of the blood and the relative amounts of these two pigments.
carotene and melanin
hypodermis
composed primarily of adipose tissue
Pressure receptors, called lamellar (Pacinian) corpuscles, are located in this layer of the integument.
dermal reticular layer
This accessory organ of the skin is composed primarily of dead, keratinized cells.
hair
The region beneath the free edge of the nail is called the
hyponychium
Name the substance that protects the DNA of rapidly dividing skin cells from the damage caused by ultraviolet rays from the sun.
melanin
These cells produce a brown-to-black pigment that colors the skin and protects DNA from ultraviolet radiation damage. The cells are
melanocytes
This structure located in the epidermis serves as a tactile (touch) receptor.
merkel cell
This region of the nail is responsible for nail growth.
nail matrix
layer of the dermis responsible for fingerprints
papillary layers
The ducts of __________ glands usually empty into a hair follicle but may also open directly on the skin surface
sebaceous
These glands are found all over the skin except in the palms of the hands and soles of the feet. They produce an oily substance that lubricates skin and hair.
sebaceous glands
Keratinase is an enzyme produced by dermatophytes. Which organ and/or structure in the body would these pathogenic fungi tend to proliferate in?
skin, hair, & nails
Like all epithelial membranes, the skin has an epithelial layer and a connective tissue layer. The keratinized epithelial and connective tissues are
stratified squamous and dense irregular
From deep to superficial, the layers of the epidermis of thin skin are ________.
stratum basale, stratum spinosum, stratum granulosum, stratum corneum
The cells in this layer of epidermis are dead, and their flat, scale-like remnants are filled with keratin.
stratum corneum
the most superficial layer of the epidermis is the
stratum corneum
This layer of the epidermis contains translucent cells filled with keratin fibrils. It is found only in thick skin.
stratum lucidum
Which of the following is not a function of the skin?
synthesis
Thick skin of the epidermis contains __________ layers
5
What is not true about cutaneous glands, hair, and nails?
they are made up of entirely dead cells
true for both eccrine and apocrine glands
they produce sweat