Anatomy and Physiology Ch.5

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46 terms · Test #2

Damage to elastic fibers in the skin of the elderly results in __________.

wrinkles

Cell divisions within the stratum __________ replace more superficial cells which eventually die and fall off.

germinativum

The epidermal layer that consists almost entirely of keratin is the __________.

stratum corneum

Cerumen is produced by glands located in the __________.

stratum corneum

Cerumen is produced by glands located in the __________.

ear canal

The layer primarily responsible for the strength of the skin is the __________ layer.

reticular

Which of these cells produce the fibers found within the reticular layer of the dermis?

fibroblasts

Which of the following glands secretes oil into the hair follicle?

sebaceous

Sudoriferous glands are also called __________ glands.

sweat

The process of skin repair after injury begins with ___________.

formation of a blood clot

What structures do you find within the hypodermis?

fat and the cutaneous plexus

The papillary layer is more superficial than the reticular layer of dermis. True or false?

true

An important vitamin that is formed in the skin when it is exposed to sunlight is

vitamin d

The type of cells that form the strata in the epidermis are

keratinocytes

When the arrector pili muscles contract,

"goose bumps" are formed

The dermis is composed of the papillary layer and the ___________.

reticular layer

The two components of the integumentary system are the

cutaneous membrane and accessory structures

Water loss due to evaporation of fluid that has penetrated through the skin is termed ________ perspiration.

insensable

________ are cells in the epidermis that are part of the immune system.

dendritic

The layer of stem cells that constantly divide to renew the epidermis is the

stratum germinativum

The epidermis of the skin is composed of which type of tissue?

keratinized stratified squamous epithelium

While walking barefoot on the beach, Joe stepped on a thorn that penetrated through the sole of his foot to the dermis. How many layers of epidermis did the thorn penetrate?

5

Melanocytes _____________.

store melanin in melanosomes

Skin exposed to ultraviolet light increases production of __________.

melanin

The primary pigments contained in the epidermis are

carotene and melanin

Cyanosis signifies that a patient

has oxygen starved skin

The ________ in keratinocytes protects the epidermis and dermis from the harmful effects of sunlight.

melanin

The epidermis recieves blood from which of the following?

dermal arteries called the papillary plexus

The layer of the skin that contains the blood vessels and nerves that are closest to the surface of the skin is the ________ layer.

papillary

The layer of the skin that contains bundles of collagen and elastic fibers responsible for the strength of the skin is the ________ layer.

reticular

Skin inflammation that primarily involves the papillary layer is termed

dermatitis

The layer of soft keratin within the hair shaft is the ___________.

medulla

The layer of hard keratin that coats the hair is termed the

cuticle

Variations in hair color reflect differences in the pigment produced by

melanocytes

Lanugo is found

on a fetus

Glands that discharge an oily secretion into hair follicles are ________ glands.

sebaceous

The ________ glands in the axilla become active at the time of puberty.The ________ glands in the axilla become active at the time of puberty.

apocrine sweat

Which of the following happens if body temperature rises above normal?

blood flow to the skin increases

Fingernails grow from which structure?

nail root

Collagen to repair a deep skin wound is produced by __________.

dermal fibroblasts

Nail production occurs at the nail

root

Mast cells are triggering a response to injury during which phase of repair?

inflammatory

In a penetrating wound, ________ divide to produce mobile cells that repair the dermis.

fibroblasts

If a fair-skinned person is sunburned, why does his or her skin turn red?

the blood flow to the skin increases

Skin can regenerate effectively even after considerable damage has occurred because

stem cells persist in both epithelial and connective tissue components of the skin even after injury

Scar tissue is the result of

large numbers of collagen fibers and relatively few blood vessels in injured areas

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