Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart2h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

5. Integumentary System

Hair

Anatomy & Physiology

5. Integumentary System

Hair

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The hair and nails are sometimes called accessory organs. Are these structures technically organs? Why or why not?

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Open Question

Which of the following is not a function of body hair in humans?

a. Protection from the environment

b. Sensation

c. Protection from mechanical trauma

d. Regulation of blood flow

Open Question

Fill in the blanks: The portion of the hair that projects from the surface of the skin is the____, and the portion within the dermis is the ___, which is embedded in a(n)_____ . The portion of the hair that contains cells that undergo mitosis during the growth stage of the hair is known as the .

Open Question

Why don't you bleed when you cut your nails? Why don't you bleed when a hair is pulled?

Open Question

Manufacturers of shampoos and conditioners often claim their products contain vitamins that are necessary to keep hair shafts healthy. Do hair shafts need vitamins? (Hint: Vitamins are required for cells to carry out certain reactions.) Why or why not? How valid are these claims?

Open Question

Multiple ChoiceMore than one choice may apply.Which structure is not associated with a hair?a. Shaftb. Cortexc. Matrixd. Cuticlee. Lunule

Open Question

Multiple ChoiceMore than one choice may apply.In investigating the cause of thinning hair, which of the following questions needs to be asked?a. Is the diet deficient in proteins?b. Is the person taking megadoses of vitamin C?c. Has the person been exposed to excessive radiation?d. Has the person recently suffered severe emotional trauma?

Open Question

An arrector pili musclea. is associated with each sweat gland,b. can cause a hair to stand up straight,c. enables each hair to be stretched when wet,d. provides new cells for continued growth of its associated hair.

Open Question

The accessory structures of the integument include the (a) blood vessels, glands, muscles, and nerves, (b) tactile discs, lamellar corpuscles, and tactile corpuscles, (c) hair, skin, and nails, (d) hair follicles, nails, sebaceous glands, and sweat glands.

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