Question 1

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

Accepted Answer

The epidermis consists of 5 distinct layers from outer to inner: stratum corneum, stratum lucidum (only in palms and soles), stratum granulosum, stratum spinosum, and stratum basale. Since the thorn reached the dermis, it had to penetrate all these layers.

Question 2

The layer of the skin that provides a barrier against bacteria as well as chemical and mechanical injuriesis the

Accepted Answer

The epidermis is the outermost layer of the skin and it provides a protective barrier against bacteria, chemical substances and mechanical injuries. It is composed of several layers, including the stratum corneum, which is responsible for the physical barrier of the skin. The dermis and subcutaneous layer are located beneath the epidermis and provide support and nourishment to the skin, but they do not serve as the primary barrier against external threats. The stratum basale is the deepest layer of the epidermis and is responsible for producing new skin cells. The sebaceous layer refers to the glands in the skin that produce oil, but it is not a separate layer of the skin itself.

Question 3

All of the following are true of epidermal ridges except that they

Accepted Answer

Epidermal ridges do not extend into the hypodermis, but rather they interconnect with the dermal papillae, which do extend into the hypodermis.

Question 4

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

Accepted Answer

Insensible perspiration refers to the loss of fluid through the skin that is not noticeable or consciously controlled, such as through normal breathing, sweating, or other normal bodily functions. Sensible perspiration, on the other hand, is the visible and noticeable loss of fluid through sweat during physical activity or in response to heat. Latent perspiration is another term for insensible perspiration, while active and inactive perspiration are not commonly used terms in this context.

Question 5

Each of the following is a function of the integumentary system except

Accepted Answer

The integumentary system does not synthesize vitamin C, which is primarily produced by the liver and kidneys.

Question 6

Water loss from insensible perspiration

Accepted Answer

Insensible perspiration refers to the continuous loss of water from the skin's surface through evaporation, which is independent of sweat gland activity. The average daily loss of water through insensible perspiration is estimated to be around 0.5 liters.

Question 7

The tough superficial layer of the epidermis is known as the stratum

Accepted Answer

The tough superficial layer of the epidermis is known as the stratum corneum. The other options listed are layers of the epidermis but are not the tough superficial layer.

Question 8

Which of following is not an accessory structure of the integumentary system?

Accepted Answer

The dermis is not an accessory structure of the integumentary system, but rather one of its main components along with the epidermis and subcutaneous tissue. The other choices (sweat glands, hair follicles, exocrine glands, and nails) are all accessory structures that help to regulate temperature, provide sensory information, or protect the body from environmental damage.

Question 9

Characteristics of the epidermis include

Accepted Answer

All of the characteristics listed are correct. The epidermis is composed of multiple layers and is flexible due to the presence of keratinocytes. Desmosomes, which are specialized cell junctions, provide structural support within the epidermis. The epidermis also serves as a barrier to UV radiation, which can be damaging to the underlying tissue.

Question 10

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

Accepted Answer

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

Question 11

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

Accepted Answer

The epidermis of the skin is composed of keratinized stratified squamous epithelium, which serves as a protective barrier for the body. It is made up of several layers of cells, including the outer layer of dead keratinized cells.

Question 12

The protein that reduces water loss at the skin surface is

Accepted Answer

Keratin is a protein that forms a protective layer on the skin, hair, and nails. In the epidermis, keratinocytes are the cells that produce keratin. The keratin layer helps to reduce water loss and protects the body from damage and infection.

Question 13

Accumulations of fluid within the epidermis or between the epidermis and the dermis is/are called

Accepted Answer

Accumulations of fluid within the epidermis or between the epidermis and the dermis are called blisters. Keloids are abnormal growths of scar tissue, scabs are dried blood or pus that form over a wound, scars are marks left on the skin after a wound has healed, and pus is a thick, yellowish or greenish fluid, typically found in infected wounds.

Question 14

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

Accepted Answer

Dendritic cells are immune cells found in the epidermis that play an important role in helping to initiate an immune response against invading microorganisms or cancerous cells. Basal cells are responsible for new skin cell growth, Merkel cells are involved in sensory perception, squamous cells are the most common type of skin cell, and melanocytes produce the pigment melanin.

Question 15

The largest quantities of keratin are found in the epidermal layer called the stratum

Accepted Answer

The stratum corneum is the outermost layer of the epidermis and is composed primarily of keratin (a tough, fibrous protein). Therefore, it contains the largest quantities of keratin. The other options (stratum lucidum, basale, granulosum, and spinosum) are all layers of the epidermis as well, but they do not contain as much keratin as the stratum corneum.

Question 16

Rapid water loss from burned skin is an extreme form of ________ perspiration.

Accepted Answer

Insensible perspiration refers to the continuous and unconscious loss of water through the skin and respiratory system, which cannot be sensed or controlled. Rapid water loss from burned skin is an extreme form of this type of perspiration. The other choices (imprudent, non-sense, impractical, vacuous) do not accurately describe this physiological process.

Question 17

Thin skin contains ________ epidermal layer(s) and thick skin contains ________ layers.

Accepted Answer

Thin skin contains 4 epidermal layers, while thick skin contains 5 layers.

Question 18

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

Accepted Answer

The strata in the epidermis are composed of layers of keratinocytes, which are the most abundant type of cell in the epidermis. Adipocytes are fat cells and are not found in the epidermis. Fibroblasts are found in the dermis, not the epidermis. Melanocytes and dendritic cells are also present in the epidermis, but they do not form the layers of strata.

Question 19

The layer of the epidermis that contains several layers of living cells connected by abundant desmosomesisthe stratum

Accepted Answer

The layer of the epidermis that contains several layers of living cells connected by abundant desmosomes is the stratum spinosum.

Question 20

The two components of the integumentary system are the

Accepted Answer

The integumentary system consists of the cutaneous membrane (which includes the epidermis and dermis) and the accessory structures (such as hair, nails, and glands), making option C the correct answer.

Quiz 5: The Integumentary System