Chapter 5: Integumentary System
The amount of melanin produce in the skin is determined by the
activity of melanocytes
Shafts of hair are composed of
dead epidermal cells
When a plastic surgeon makes an incision, they should be careful to
enter parallel to the lines of cleavage
The layer of the skin that lacks blood vessels is
epidermis
This layer is composed of keratinized stratified squamous epithelium
epidermis
The stratum lucidum
is present only in thick skin
The dermis does not contain
mucous glands
Accessory structures of skin include hair, glands and nails. What are pilis important function?
-Protection -Reduction of heat loss -Sensing light touch
Which is not a function of the skin?
-Protection against mechanical injury -Protection against foreign invaders -Regulation of body heat
The color of human skin depends upon
-The yellowish tinge of epidermal cells -The number of underlying blood vessels -The kind and amount of pigment
Skin shows signs of aging because
-dehydration -Decrease in skin thickness -Decrease in the number of functional melanocytes -Breakdown on collagen and elastic fibers
Modified sweat glands in the ear produce a waxy secretion called
Cerumen
The dermis is primarily composed of which tissue type?
Connective
This layer is composed mainly of connective tissue with collagen and elastic fibers.
Dermis
The most common sweat gland that release a watery secretion are _______ glands.
Eccrine
What is the function of the epidermal ridges?
Increase the firmness of grip
This epidermal cell has a role in immunity and disease resistance
Langerhans
The various areas of your body are composed of thick hairless skin, such as:
Palm and digits
The superficial region of dermis that is composed of areolar connective tissue is called
Papillary layer
Which layer of epidermis would be gradually shed through bathing?
Stratum Corneum
This layer of the epidermis contains layers of flattened keratinocytes that are going through apoptosis.
Stratum Granulosum
Which epidermal layer is closest to a blood supply?
Stratum basale
Hemoglobin found in the dermis provides pink tone to the skin.
True
Skin cells play an important role in the production of this precursor in folic acid:
Vitamin D