Chapter 5, Integumentary system

The skin perceives a variety of sensations from several types of sensory receptors. Which receptor would let a person know if there was a small insect walking across a hair on their arm?

root hair plexus

This type of exocrine gland undergoes a higher rate of mitosis due to its holocrine secretion.

sebaceous gland

Secretion mixture of fats sterols proteins and salts that prevent water loss and can inhibit the growth of some bacteria.

sebum

Tactile epithelial cells are located in the

stratum basale

The skin is also known as a (the) _________.

stratum basale

This layer is attached to the basement membrane by hemidesmosomes and to other cells by desmosomes.

stratum basale

The skin is known as the _________ membrane.

Cutaneous

The skin is also known as a (the) _________.

Cutaneous membrane

Which pigment secreted by specialized cells in the skin is capable of absorbing ultraviolet light?

Melanin

Which layer has stem cells that undergo cell division to continually produce new keratinocytes?

Stratum basale

The majority of body hair of _________ is vellus rather than terminal hair.

adult females

The skin provides a physical and chemical barrier to harmful agents by:

all of these

Which feature(s) of the skin protect(s) us against microbes such as bacteria?

all of these are correct

Which of the following statements is correct?

all of these statements are correct

Which of the following statements about a hair are true?

all of these statements are true

Which of the following functions of the skin explains the skin's pink hue?

blood reservoir

Which is the correct sequence of phases for deep wound healing?

inflammation, migration, proliferation, maturation

Which of the following is the most direct way that the skin contributes to the function of the muscular system?

it helps provide calcium ions needed for protection

Which statements is not correct about the dermis?

it is thinner in men than in woman

The buildup of bilirubin in an infant's blood can occur if the liver does not remove the chemical. This condition is

jaundice

A raised scar that extends into previously normal tissue is a(n)

keloid scar

Sutures are required to close up a tear in the skin. What term best describes this injury?

laceration

Which condition results from androgens inhibiting hair growth in genetically predisposed adults?

male - pattern baldness

Albinism is the inherited inability to produce

melanin

Without enzymatic action of tyrosinase what pathway is blocked in the body pertaining to skin?

melanin production

Which exocrine gland is primarily used for thermoregulation?

eccrine sweat gland

A child is examined for chronic pruritic (itching) plaques that appear red in the flexural areas of the body. What condition is the child most likely presenting?

eczema

Which statements are true? 1. The majority of the skin does not contain stratum lucidum; 2. Stratum lucidum is found in areas of high friction such as the palms and soles; 3. Live keratinocytes are located in the stratum lucidum; 4. Friction will cause the stratum lucidum to form calluses.

1 and 2

Choose the following statements that describe keratin. 1. Keratin is a tough fibrous protein; 2. Keratin is used for pigmenting skin; 3. Keratin helps protect the skin; 4. Keratin participates in immune responses; 5. Keratin protects the skin from UV light.

1 and 3

Which statements describe the function and structure of the skin? 1. Collagen is the strongest fiber in the skin; 2. Blood vessels in the dermis supply the epidermis with nutrients; 3. The arrangement of epidermal ridges mixed with sweat create fingerprints; 4. The papillary layer is the strongest portion of the dermis;5. The reticular layer promotes stretching of the skin.

1, 2, 4, 5

Which statements describe sebaceous glands? 1. oil producing 2. merocrine 3. holocrine 4. thermoregulation 5. sebum 6. Apocrine

1,3,5

Which statements describing vitamin D are true. 1. The skin produces Vitamin D when exposed to UV light. 2. When the skin is exposed to UV light it begins the reaction to convert the precursor molecule to calcitriol in the liver than kidneys. 3. Vitamin D supplements can be taken if individuals are not exposed to UV light. 4. Vitamin D stimulates the uptake of calcium from the intestines. 5. Vitamin D inhibits the function of phagocytes in immunity.

2, 3, 4

A pair of scissors slips while you are cutting paper. You slice through your forearm and blood appears. What is the order of the skin you cut from superficial to deep. 1. Dermis; 2. Stratum spinosum; 3. Stratum granulosum; 4. Stratum corneum; 5. Stratum basale; 6. Stratum lucidum.

4, 3, 2, 5, 1

What criteria are used to distinguish thick and the thin skin?

All of these are criteria used

What factors contribute to the susceptibility of aging skin to infection?

All of these contribute

Epithelium is migrating across wound.

B

Which of the following statements is incorrect?

Ceruminous glands produce a waxy substance which protects the genitals.

From which of the primary germ layers of the embryo does the epidermis of the skin develop?

Ectoderm

In a skin infection which cell will take up and process microbial antigens?

Intraepidermal macrophages (Langerhans cells)

As newly formed cells of the stratum basale are pushed to the surface they accumulate keratin and undergo apoptosis. This process is referred to as _______.

Keratinization

About 90% of the cells of the epidermis are of which type?

Keratinocytes

Anorexia may cause adults to develop fine unpigmented hairs to help with warmth and insulation. Which type of hair is described?

Lanugo

The hyponychium is the __________ of the nail

Nail bed

Vitamin C is important for collagen synthesis. Which area of the skin would be most affected if there is a deficiency in vitamin c?

Reticular region of the dermis

Most adipose tissue in the body is considered 'white fat'. Why is the subcutaneous layer often yellowish-orange?

The pigment carotene is stored there.

"Goose bumps" are caused by

contraction of arrector pili muscles.

A ballet dancer may form hardened areas over their toe joints due to constant pressure and friction from their point shoes. What skin condition most likely developed on their toe joints?

corn

You stepped on a nail. List the sequential strata of the epidermis that the nail penetrated through to reach the dermis.

corneum, lucidum, granulosum, spinosum, basale

Put the events of keratinization in order. A. Accumulate keratohyalin granules; B. Cells increase in size some retain ability to divide; C. Cell membrane thickens. Cells imbedded in lipid matrix; D. Cells within this layer proliferate

d,b,a,c

Dense irregular connective tissue will be found in the

dermis

How do nutrients reach the epidermis?

diffusing through the tissue fluid from blood vessels in the dermis.

Keratinized stratified squamous epithelium composes the

epidermis

Which of the following substances can penetrate the skin?

fat soluble substance, oxygen and carbon dioxide, organic solvents like acetone

Which of the following would not be a change to the skin that occurs with aging?

formation of lanugo

The subcutaneous layer is also known as the

hypodermis

Apoptosis of cells occurs within the

stratum granulosum

This skin layer is only present in places subjected to high levels of mechanical wear-and-tear and provide an additional protective layer where it occurs such as in the soles of the feet palms and fingertips.

stratum lucidum

Which structures develop as down growths of the stratum basale?

sudoriferous glands, hair follicles

Which structure found in the skin plays an important role in the thermoregulation?

sweat glands

Which of these statements is incorrect?

tattoos may interfere with childbirth

In the elderly blood supply to the dermis is reduced and sweat glands are less active. This combination of factors would most affect

the ability to thermoregulate

Which is NOT true about melanocytes?

they undergo rapid mitosis to regenerate skin

An individual allergic to peanut butter eats a snack containing trace amounts. While the reaction is not severe the individual shows signs of elevated patches all over their skin. These patches are

urticaria

During development in the womb the fetus by the fifth month is covered and protected by a fatty substance called __________ .

vernix caseosa