Ch 6 quiz - Integumentary System

Describe the events occurring during keratinization by matching each event with a location. Then, drag each site-linked event into the correct order on the image.

1. Cells are mitotic; deepest epidermal layer Stratum basale 2. Contains several layers of polygonal keratinocytes Stratum spinosum 3. Keratinization begins; keratinocytes begin to fill with keratin Stratum granulosum 4. The keratinocytes within this layer are flattened and filled with the protein called eleidin Stratum lucidum 5. These dead cells have a hard protein envelope, contain keratin, and are often peeled or scraped off Stratum corneum

Match the type of skin cancer with its description. 1. Malignant melanoma 2. Squamous cell carcinoma 3. Basal cell carcinoma

1. Malignant melanoma: Most deadly type 2. Squamous cell carcinoma: Arises from keratinocytes of stratum spinosum 3. Basal cell carcinoma: Most common; originates in stratum basale

Match the major skin gland with its description. 1. Produce sebum, an oily substance rich in lipids 2. Consist of eccrine and apocrine glands

1. Sebaceous glands 2. Sweat glands

Match the structure with its protective function. 1. Protects against abrasion; contains melanin, which absorbs damaging UV light 2. Protects against abrasion; acts as a heat insulator, protects the eyes against foreign objects 3. Produce secretions that create an environment unsuitable for some microorganisms 4. Protect the ends of the fingers and toes from damage; can be used in defense

1. Skin 2. Hair 3. Glands 4. Nails

Place the events that occur during wound healing into the correct order, using the images as a guide.

1. The cut blood vessels bleed into the wound 2. A blood clot forms, leukocytes enter the wound 3. Blood vessels regrow, granulation tissue forms 4. Stratum basale regenerates, CT fibrosis occurs

Place the following layers of the hair in order from superficial to deep.

1. cuticle 2. cortex 3. medulla

Place the following layers in order from superficial to deep.

1. epidermis 2. dermis 3. hypodermis 4. fascia 5. muscle

Label the structures of the integument.

1. epidermis 2. papillary layer of dermis 3. reticular layer of dermis 4. subcutaneous layer

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

It stabilizes the position of the skin and binds it to underlying structures. It is a keratinized, squamous epithelium. It is the superficial region of the dermis. It is responsible for the ridges known as fingerprints.

Select the way in which sweat glands function in homeostasis.

Production of vitamin D3 Temperature regulation Protection Sensory perception

Nails are scalelike modifications of which layer of the integument?

Stratum basale Stratum spinosum Stratum corneum Stratum granulosum

Fill-in the sentence with the appropriate part of the nail. Then place the structures in order from proximal to distal.

The nail matrix contains mitotic cells. The nail root is deep to the eponychium. The nail body contains layers of compacted, highly keratinized epithelial cells. The free edge of the nail is the part of the nail that can over hang the tip of the finger.

Of the following factors, which one does not contribute to skin aging?

The skin increases the number and efficiency of epidermal dendritic cells, causing an increase in immune responsiveness. Beginning in middle age, reduced stem cell activity in the epidermis results in thinner skin that is less likely to protect against abrasive, mechanical trauma. As individuals get older, collagen fibers in the dermis decrease in number and organization, and elastic fibers lose elasticity. Chronic overexposure to UV rays can damage the DNA in epidermal cells and accelerate aging as well as increase the risk of skin cancer.

epidermis piloerector muscle dermis hypodermis hair follicle

Which structure is highlighted?

epidermis sebaceous gland dermis hypodermis subcutaneous layer

Which structure is highlighted?

sebaceous gland piloerector muscle hair root hair follicle hair

Which structure is highlighted?

Reddened skin reflects

dilated blood vessels, sending more blood to the dermis. eating too many carrots. inheriting extra melanin. constricted blood vessels, sending more blood to the epidermis.

The subcutaneous layer of skin consists of

epithelial tissue. areolar and adipose tissue. epithelium and areolar tissue. adipose tissue and skeletal muscle tissue. blood and nerves.

Melanin is produced and stored in

melanocytes. the basement membrane. the dermis. keratinocytes.

Contraction of the arrector pili muscles causes the hair follicle to

resist extraction. lie at an oblique angle next to the skin. become perpendicular to the skin, resulting in the hair "standing on end." release the hair root.

Which structure is highlighted?

sebaceous gland piloerector muscle hair bulb hair follicle hair

Skin cells play an important role in producing

vitamin A. vitamin B. vitamin C. vitamin D. vitamin E.