Skin Layers
Distinguish between the epidermis and dermis
The epidermis is the outer epithelial layer, and the dermis is the thick layer of skin beneath the epidermis
Describe how nails are formed
Nails form from keratinized epidermal cells.
Functions of the skin include water loss prevention, temperature regulation, and sensory reception. True or False.
True
What is the epidermis?
Outer skin layer
What is inflammation?
A normal response to injury and stress
What are the functions of the subcutaneous layer?
Insulation, fat storage, and attaching skin to underlying tissues/organs
What is the difference between a hair and a hair follicle?
Hair is the structure itself, and hair follicle is the skin structure it grows from
Why is body temperature regulation important?
To maintain homeostasis
What is the dermis?
Middle skin layer
What are common signs of inflammation?
Redness, swelling, pain, and warmth.
The linings of respiratory passages are composed of a layer of what tissue?
Pseudostratified columnar epithelium
How is hair color determined?
By the amount of melanin
How does the skin promote heat loss?
Through sweating and dilation of blood vessels
What is melanin?
Pigment that determines skin color
Which type of burn is most likely to leave a scar?
Third-degree burn
What happens during keratinization?
Skin cells fill with keratin, die, and harden
What is the function of sebaceous glands?
They produce an oily substance (sebum) that lubricates skin and hair
How does the body respond to decreasing body temperature?
Vasoconstriction and shivering
What are sebaceous glands?
Glands that secrete an oily substance
What is the function of a scab?
Protect the wound while healing occurs
Name the five layers of the epidermis
Stratum corneum, lucidum, granulosum, spinosum, basale
Which sweat glands help cool the body and are found on the forehead, neck, and back?
Merocrine sweat glands
How do dendritic cells and tactile cells contribute to the protective function of skin?
Dendritic cells help protect the skin by detecting and helping destroy invading microbes, while tactile cells help the skin respond to touch and environmental stimuli.
What is the arrector pili muscle?
Smooth muscle in the skin associated with the hair follicle
How is the extent of a burn determined?
By estimating the percentage of body surface burned