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