Connect Practice Integumentary

Subcutaneous tissue is part of the integumentary system. T/F

False

The amount of fat in the subcutaneous tissue varies with age and diet, and is not influenced by gender. T/F

False

Differences in skin pigmentation are due to varying numbers of melanocytes within each individual. T/F

False All people have roughly the same number of melanocytes; therefore, differences in skin pigmentation are due to the amount of melanin the melanocytes produce.

When the body temperature drops below normal, dermal blood vessels dilate. T/F

False Dermal vessels constrict when body temperature drops below normal in order to conserve heat. This explains why we look paler when we are exposed to cold temperatures.

Lines of cleavage partition the skin and indicate the predominant direction of underlying elastic fibers in the dermis. T/F

False Lines of cleavage partition the skin and indicate the predominant direction of underlying collagen fibers in the dermis.

Which statement is true regarding the subcutaneous layer (hypodermis)?

It stabilizes the position of the skin and binds it to underlying structures.

An alternate name for subcutaneous tissue is the hypodermis. T/F

True

Regeneration in the skin replaces damaged or dead cells with the same cell type and restores organ function. T/F

True

The subcutaneous layer of skin consists of

areolar and adipose tissue

Contraction of the arrector pili muscles causes the hair follicle to

become perpendicular to the skin, resulting in the hair "standing on end."

Forms the bulk of the hair; consists of cells containing hard keratin

cortex

Outer layer of the hair; single layer of cells containing hard keratin

cuticle

The dermis is composed largely of

dense irregular connective tissue

Which of the following is a normal response to excessive loss of body heat in a cold environment?

dermal blood vessels constrict

Portion of the connective tissue that surrounds the epithelial root sheath

dermal root sheath

Mass of epithelial cells within the bulb that produce the hair

matrix

Central axis of the hair

medulla

Exposure to ultraviolet light darkens skin by stimulating synthesis of

melanin

Melanin is produced and stored in

melanocytes

You accidentally cut your fingernail too far, causing a sharp pain and some bleeding. Which part of your nail was injured?

nail bed

Protect the ends of the fingers and toes from damage; can be used in defense

nails

The portion of the hair that is below the surface of the skin

root

The oily, waxy secretion called sebum is produced by

sebaceous glands

Protects against abrasion; contains melanin, which absorbs damaging UV light

skin

The integument consists of the epidermis, which is composed of _____________, and the dermis, which is composed primarily of ____________ connective tissue.

stratified squamous epithelium; dense irregular

The layer of the epidermis that includes melanocytes and a single row of columnar cells that undergo mitosis is the

stratum basale

Sweat glands and sebaceous glands develop from which layer of the integument?

stratum basale of the epidermis

Nails are scalelike modifications of which layer of the integument?

stratum corneum

Select the way in which sweat glands function in homeostasis.

temperature regulation

Subcutaneous tissue binds the skin to underlying structures T/F

true

The skin contains numerous sensory receptors located in both the epidermis and the dermis. T/F

true The skin contains numerous sensory receptors located in both the epidermis and the dermis. These sensations include detection of heat, cold, touch, pressure, and vibration.

Keratinocytes play an important role in producing

vitamin D

The sweat glands that produce a watery substance and are associated with exercise and stress are the _________ sweat glands, while glands that produce an organic substance that causes body odor are the __________ sweat glands.

eccrine; apocrine

Sweat cools the body by

evaporation

The skin's response to severe injuries or burns, when functional activities are not restored, is called

fibrosis

Produce secretions that create an environment unsuitable for some microorganisms

glands

Protects against abrasion; acts as a heat insulator, protects the eyes against foreign objects

hair

Expanded knob at the base of the hair root

hair bulb

Contains the hair; consists of epithelial and dermal root sheaths

hair follicle

Which of the following is not found in thick skin?

hair follicles

Protrudes above the surface of the skin

hair shaft