Anatomy & Physiology (6th Edition)
Anatomy & Physiology (6th Edition)
6th Edition
ISBN: 9780134298924
Author: Marieb
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 1MC

Which epidermal cell type is most numerous? (a) keratinocyte, (b) melanocyte, (c) dendritic cell, (d) tactile cell.

Expert Solution & Answer
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Summary Introduction

To determine:

The name of the epidermal cell which is found numerously in the body is:

  1. keratinocytes

  2. melanocyte

  3. dendritic cell

  4. tactile cell

Answer to Problem 1MC

Solution:

(a) Keratinocytes: The epidermis is composed of 90% of keratinocytes.

Explanation of Solution

Explanation for the correct answer:

The epidermis is the outer layer of the body. The keratinocytes are the cells that make up the maximum of the epidermis. These cells reduce water loss from the body and also protect the body from external stress and microbes. Thus, option (a) is considered as correct option.

Explanation for the incorrect answer:

Option (b) is given as melanocyte. Melanocytes are the melanin forming cells. Melanin is a pigment responsible for the skin color. These cells consists approximately 5% to 10% of the cells present in basal layer of epidermis. Thus option (b) is an incorrect answer.

Option (c) is given as dendritic cell. Dendritic cells are antigen- presenting cells found in all layers of epidermis and among all stratum spinosum is the most prominent site. These cells make 2% - 4% of the total epidermial cells. Thus option (c) is an incorrect answer.

Option (d) is given as tactile cells. These are the sensory receptor cells present in epidermis and help to perceive the environment through tactile sense. These cells consists 0.5% to 5% of the total epidermal cells. Thus option (d) is an incorrect answer.

Hence, option (b), (c) and (d) are considered as incorrect options.

Conclusion

Thus it is concluded that keratinocytes are the cells that makes approximately 90% of the total epidermal population, and considered as most numerously found cell in the epidermis.

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Chapter 5 Solutions

Anatomy & Physiology (6th Edition)

Ch. 5.5 - What are the concentric regions of a hair shaft,...Ch. 5.5 - Prob. 12CYUCh. 5.5 - What is the role of an arrectorpili muscle?Ch. 5.5 - What is the function of the hair papilla?Ch. 5.6 - Why is the lunule of a nail white instead of pink...Ch. 5.6 - Why are nails so hard?Ch. 5.7 - Which cutaneous glands are associated with hair...Ch. 5.7 - Prob. 18CYUCh. 5.7 - Prob. 19CYUCh. 5.7 - Sebaceous glands are not found in thick skin. Why...Ch. 5.8 - What chemicals produced in the skin help provide...Ch. 5.8 - Which epidermal cells play a role in body...Ch. 5.8 - How is sunlight important to bone health?Ch. 5.8 - Prob. 24CYUCh. 5.9 - Which type of skin cancer develops from the...Ch. 5.9 - What name is given to the rule for recognizing the...Ch. 5.9 - The healing of burns and epidermal regeneration is...Ch. 5.9 - Prob. 28CYUCh. 5 - Which epidermal cell type is most numerous? (a)...Ch. 5 - Which cell functions as part of the immune system?...Ch. 5 - The epidermis provides a physical barrier due...Ch. 5 - Skin color is determined by (a) the amount of...Ch. 5 - The sensations of touch and pressure are picked up...Ch. 5 - Which is not a true statement about the papillary...Ch. 5 - Skin surface markings that reflect points of tight...Ch. 5 - Which of the following is not an epidermal...Ch. 5 - An arrector pili muscle (a) is associated with...Ch. 5 - Prob. 10MCCh. 5 - Sebum (a) lubricates the surface of the skin and...Ch. 5 - Prob. 12MCCh. 5 - Which epidermal cells are also called prickle...Ch. 5 - Is a bald man really hairless? Explain.Ch. 5 - You go to the beach to swim on an extremely hot,...Ch. 5 - Prob. 16SAQCh. 5 - Describe the process of hair formation, and list...Ch. 5 - Prob. 18SAQCh. 5 - Prob. 19SAQCh. 5 - Prob. 20SAQCh. 5 - Why are there no skin cancers that originate from...Ch. 5 - A man got his finger caught in a machine at the...Ch. 5 - Prob. 23SAQCh. 5 - A common belief is that having your hair cut makes...Ch. 5 - Integumentary System A terrible collision between...Ch. 5 - Integumentary System A terrible collision between...Ch. 5 - Integumentary System A terrible collision between...Ch. 5 - Integumentary System A terrible collision between...
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