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 Heart3h 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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Problem 13

Textbook Question

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 _______.

Verified step by step guidance

Step 1: Understand the anatomy of the hair structure. Hair consists of two main parts: the portion above the skin's surface and the portion below the skin's surface. The portion above the skin is called the 'shaft,' while the portion below the skin is called the 'root.'

Step 2: Recognize that the root of the hair is embedded within a structure called the 'hair follicle,' which is located in the dermis layer of the skin. The follicle provides nourishment and support for hair growth.

Step 3: Identify the region of the hair responsible for growth. The portion of the hair containing cells that undergo mitosis during the growth stage is called the 'hair matrix.' This is located at the base of the hair follicle.

Step 4: Recall that the hair matrix is composed of actively dividing cells. These cells produce new hair cells, which are pushed upward to form the hair shaft as older cells die and become keratinized.

Step 5: Summarize the answer by filling in the blanks: The portion of the hair that projects from the surface of the skin is the 'shaft,' the portion within the dermis is the 'root,' which is embedded in a 'hair follicle.' The portion of the hair that contains cells that undergo mitosis during the growth stage of the hair is known as the 'hair matrix.'

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Hair Structure

Hair is composed of two main parts: the hair shaft, which is the visible portion that extends above the skin's surface, and the hair root, which is located beneath the skin in the dermis. The hair follicle surrounds the root and anchors the hair in place, playing a crucial role in hair growth and health.

Dermis

The dermis is the layer of skin beneath the epidermis that contains connective tissue, blood vessels, and hair follicles. It provides structural support and nourishment to the hair follicles and is essential for the overall health of the skin and hair.

Hair Growth and Mitosis

The hair bulb, located at the base of the hair follicle, contains actively dividing cells that undergo mitosis during the hair growth phase. This process is vital for producing new hair cells, which push older cells upward, leading to hair elongation and growth.