Lab 7 HW
__________ glands are found primarily in the genital and axillary areas.
Apocrine
__________ is a yellow-orange pigment found in the stratum corneum and the hypodermis.
Carotene
What is true about the blood supply to the skin?
Epidermis is avascular and dermis is richly vascularized.
What is true about both the epidermis and the dermis?
Sensory receptors are present in each.
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, and nails
What is not true about cutaneous glands, hair, and nails?
They are made up entirely of dead cells.
Which of the statements below is true for both eccrine and apocrine glands?
They produce sweat.
Nails originate from the epidermis.
True
The hypodermis is ________.
composed primarily of adipose tissue
Pressure receptors, called lamellar (Pacinian) corpuscles, are located in this layer of the integument.
dermal reticular layer
The ________ is often referred to as the cuticle of a nail.
eponychium
This accessory organ of the skin is composed primarily of dead, keratinized cells.
hair
Skin color can indicate certain disease states. A reddened, flushed face might indicate ________.
hypertension, fever, or embarrassment
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
This layer of the dermis is responsible for fingerprints.
papillary layer
The ducts of __________ glands usually empty into a hair follicle but may also open directly on the skin surface.
sebaceous
The portion of a hair that projects from the scalp surface is known as the __________.
shaft
All the following are functions of the skin EXCEPT __________.
site of vitamin A synthesis
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
Vitiligo is a disorder in which the pigmentation of the skin is uneven, resulting in white patches. Recent research suggests that vitiligo might be an autoimmune disorder. Which cells would you expect to be most affected?
Melanocytes
The ________ is the structure responsible for goose bumps.
arrector pili
The region beneath the free edge of the nail is called the ________.
hyponychium
These are the most abundant epidermal cells.
keratinocytes
A freckle is a concentrated spot of this pigment.
melanin
Name the substance that protects the DNA of rapidly dividing skin cells from the damage caused by ultraviolet rays from the sun.
melanin
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
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
Skin color is determined by the degree of oxygenation of the blood and the relative amounts of these two pigments.
melanin and carotene
These cells produce a brown-to-black pigment that colors the skin and protects DNA from ultraviolet radiation damage. The cells are __________.
melanocytes
Which of the following is not a function of the skin?
synthesizing vitamin C
Which of the following pigments is not involved in determining skin color?
white pigments in skin cells