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Read the attached PDF of Section 5.4 'Functions of the Skin' from Chapter 5 of Tortora and Derrickson Principles of Anatomy and Physiology, 14th Ed.

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In adults the skin covers an area of about 2 square meters and weighs 4.5-5kg. It ranges in thickness from 0.05mm on the eyelids to 4.00 mm on the heels. The skin consists of multiple sets of skin layers:

The Epidermis, a superficial layer which consists largely of epithelial tissue

The Dermis, the deeper layer which is made up of connective tissue.

A third layer is also important for insulation - the Hypodermus.

Principles of Anatomy & Physiology 14th Edition - Tortora

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Melanocytes produce the pigment melanin

Intraepidermal macrophages which participate in immune response

Keratinocytes which produce keratin fibres

Tactile epithelial cells which function in the sensation of touch

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Integumentary System
https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology#integumentary-system-introduction

Please watch the first 3 videos
1) Meet the skin!
2) What is the skin?
3) What lies beneath the epidermis?

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Skin or 'cutaneous membrane' covers the external surface of the human body and is the largest organ of the body in weight.

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Read the attached PDF on 'Structural Basis of Skin Colour' from Chapter 5 of Tortora and Derrickson: Principles of Anatomy and Physiology, 14th Ed.

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Tortora 14th ed. Structural Basis of Skin Colour

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The 'Integumentary System' is composed of :

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The 'Integumentary System' is composed of :

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Skin - Epidermis and the Dermis
plus accessory structures:

Hair

Oil/Sweat Glands

Nails

Sensory Receptors

Type 'integumentary' in to an internet search engine to learn the correct pronunciation