BIOL 1611 – Anatomy & Physiology I            Name___________________________

LECTURE HOMEWORK – The Integumentary System

1. Which is not a function of the skin?
   1. Protection against mechanical injury
   2. Regulation of body heat
   3. Protection against foreign invaders
   4. All of the above are functions

2. The layer of skin that lacks blood vessels is
   1. Subcutaneous.
   2. Dermis.
   3. Integument.
   4. Epidermis.

    

3. The dermis does not contain
   1. Sebaceous glands.
   2. Hair follicles.
   3. Mucous glands.
   4. Nerves.

4. The color of human skin depends upon
   1. The yellowish tinge of epidermal cells.
   2. The number of underlying blood vessels.
   3. The kind and amount of pigment.
   4. All of the above.

5. Which layer of epidermis would be gradually shed through bathing?
   1. Stratum granulosum
   2. Stratum corneum
   3. Stratum basale
   4. Stratum lucidum

6. The dermis is primarily composed of which tissue type?
   1. Nervous
   2. Muscle
   3. Connective
   4. Epithelial

7. Which epidermal layer is closest to a blood supply?
   1. Stratum basale
   2. Stratum spinosum
   3. Stratum granulosum
   4. Stratum corneum

8. Cells of the ___ are keratinized and dead.
   1. Papillary layer
   2. Stratum spinosum
   3. Stratum basale
   4. Stratum corneum
   5. Stratum granulosum

9. Which of the following skin conditions or appearances would most likely result from liver failure?
   1. Pallor
   2. Erythema
   3. Pemphigus vulgaris
   4. Jaundice
   5. Melanization

10. All of the following interfere with the microbial invasion of the skin except
    1. The acid mantle.
    2. Melanization.
    3. Inflammation.
    4. Keratinization.
    5. Sebum.

11. Which of the following skin cells alert the immune system to pathogens?
    1. Fibroblasts
    2. Melanocytes
    3. Keratinocytes
    4. Dendritic cells
    5. Merkel cells.

12. The hypodermis
    1. Is the layer of skin where the hair is produced.
    2. Is the layer of skin where the nails are produced.
    3. Connects the dermis to the epidermis.
    4. Is dense irregular connective tissue.
    5. Contains approximately half of the body’s stored fat.

13. Concerning hair growth:
    1. Hair falls out of the hair follicle at the end of the growth stage.
    2. Most of the hair on the body grows continuously.
    3. Cutting or plucking the hair increases its growth rate and thickness.
    4. Genetic factors and the hormone testosterone are involved in “pattern baldness.”
    5. Eyebrows have a longer growth stage and resting stage than scalp hair.

14. Smooth muscles that produce “goose bumps” when they contract and are attached to hair follicles are called
    1. External root sheaths.
    2. Arrector pili.
    3. Dermal papillae.
    4. Internal root sheaths.
    5. Hair bulbs.

15. Most of the nail is produced by the
    1. Eponychium (cuticle).
    2. Hyponychium.
    3. Nail bed.
    4. Nail matrix.
    5. Dermis.

16. The skin aids in maintaining the calcium and phosphate levels of the body at optimum levels by participating in the production of
    1. Vitamin A.
    2. Vitamin B.
    3. Vitamin D.
    4. Melanin.
    5. Keratin.

17. Which of these processes increase(s) heat loss from the body?
    1. Dilation of dermal arterioles
    2. Constriction of dermal arterioles
    3. Both a and c
    4. Both b and c

18. Which of the following factors increases with age?
    1. Blood flow to the skin
    2. Number and diameter of elastic fibers in the skin
    3. Number of melanocytes in some localized areas of the skin
    4. Melanin production in the hair
    5. Activity of sebaceous and sweat glands in the skin

19. The function of melanin in the skin is
    1. Lubrication of the skin.
    2. Prevention of skin infections.
    3. Protection from ultraviolet light.
    4. To reduce water loss.
    5. To help body temperature.

20. In third degree (full-thickness) burns, both the epidermis and dermis of the skin are destroyed.  Which of the following conditions would not occur as a result of a third degree burn?
    1. Dehydration (increased water loss)
    2. Increased likelihood of infection
    3. Increased swelling
    4. Loss of sensation in the burned area
    5. Poor temperature regulation in the burned area