A&P 1 Lab Exercise 4 Quiz

"Goose bumps" are caused by

contraction of arrector pili muscles.

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

corneum, lucidum, granulosom, spinosum, basale

The skin is known as the _________ membrane.

cutaneous

Which skin structure helps improve your grip on a wet glass?

dermal papillae

The subcutaneous layer is also known as the

hypodermis

What kinds of epidermal cells comprise about 90% of the epidermis?

keratinocyte

What is the function of sebum?

lubricate the skin and hair

Which epidermal cell type is involved in getting a suntan?

melanocyte

Which part of the nail is visible?

nail body

Which skin layer consists of dense, irregular connective tissue?

reticular

Into which dermal layer do epidermally-derived hair follicles and glands extend?

reticular layer

After a third degree burn, body hair will not likely regrow in that area because...

the hair matrix and papilla is destroyed when the burn extends into reticular dermal layer

Which of the following does not indicate a function of the skin? (a) sensory reception (b) protective barrier for the body (c) temperature regulation (d) vitamin K production

(d) vitamin K production

What is the thickened epithelial tissue at the proximal end of the nail body called? 1. Cuticle 2. Eponychium 3. Hyponychium

1. Cuticle 2. Eponychium

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. 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.

Which of these sudoriferous glands are located in axillary and genital areas and become active after puberty?

Apocrine sweat glands

In the photomicrograph shown, which layer is only seen in thick skin?

B

Which structure in the figure detects touch sensations?

B

In the diagram of skin shown below, where is smooth muscle found?

D

In the photomicrograph, which layer will contain melanocyte projections, keratinocytes and intraepidermal macrophages (Langerhan cells)?

D

Permanent tattoos are made by injecting pigment into the skin. Into which part of the skin is the pigment injected?

Dermis

How do nutrients reach the epidermis?

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

Which exocrine gland is primarily used for thermoregulation?

Eccrine sweat gland

Which part(s) of the skin "peel(s)" off after a minor sunburn?

Epidermis

Identify the correct area of the body shown in this image.

Forearm

Which part of the hair contains the matrix?

Hair bulb

What kinds of epidermal cells comprise about 2% of the epidermis?

Langerhans & Merkel cells

This epidermal cell is part of the immune system that protects the skin against microbes.

Langerhans cell

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

Melanin

What kinds of epidermal cells comprise about 8% of the epidermis?

Melanocyte

Which of the following is an areolar connective tissue layer beneath the basement membrane?

Papillary layer of the dermis

Identify the correct area of the body shown in this image.

Sole of foot

Cortisone is a steroid that is applied to the skin to reduce inflammation. Cortisone acts on cells within the dermis and can travel through unbroken epidermis to reach cells in the dermis. If the epidermis is such a good barrier, how can cortisone easily travel through it?

Steroids are lipids that can cross the plasma membranes easily

From which epidermal layer does a basal cell carcinoma arise?

Stratum basale

From which epidermal layer does a malignant melanoma arise?

Stratum basale

This layer of the epidermis is where the most rapid cell division occurs.

Stratum basale

Which epidermal layer contains stem cells?

Stratum basale

A tough, water-repellent epidermal layer that contains dead squamous-shaped cells.

Stratum corneum

Which epidermal layer contains visible granules?

Stratum granulosum

The cells of this layer appear to have thorn-like projections in prepared slides.

Stratum spinosum