2 - UNIT 2 The Integumentary System Skin Appendages of Skin...

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UNIT 2 The Integumentary System Skin Appendages of Skin (7th edition)
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How to use your PowerPoint lectures This PowerPoint lecture follows your textbook very closely; read the slides along with the associated sections in Chapter 5 of your textbook (at the same time); be sure to view the figures and tables in your book There is a lot of material in the textbook that we do not have time to cover in this course -- please read this extra content, but keep in mind that you will not find it on an exam -- use the lecture as your guide; your exams are based mainly on your lectures and lab activities; don’t forget that you can download and print this lecture in the form of an outline (without multimedia content); the content of the PowerPoint and printable outline is essentially the same (7th edition)
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Integumentary System Overview SKIN - outer protective covering of the body; accounts for 7% of our body weight HAIR - less useful in humans than in other mammals in maintaining warmth; distributed over almost all of our skin surface GLANDS - glands are epithelial in origin (composed of epithelial tissue), but are found in the dermis of the skin, which is composed of connective tissue NAILS - similar to the hoof or claw of other mammals; work as built-in-tools for picking up objects or scratching an itch *When we look at ourselves in the mirror, almost everything that we see on the surface (outer skin, hair, and nails) is dead! (7th edition)
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Overview of Skin (fig. 5.1) composed of 2 major layers: the EPIDERMIS and DERMIS appendages of the skin (e.g. glands, arrector pili muscles, and hairs) nervous structures (e.g. Meissner’s corpuscles, Pacinian corpuscles, and free nerve endings) (7th edition)
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Epidermis -- composed of keratinized, stratified squamous epithelium Epidermal Cells: KERATINOCYTES - found in the deepest layers of the epidermis; produce a tough fibrous protein called KERATIN MELANOCYTES - found in the stratum basale (basal layer) of the epidermis; produce a dark skin pigment called MELANIN , which helps to protect the skin cells from cancer causing UV rays of the sun MERKEL cells - found in the stratum basale ; come in contact with sensory neurons; involved in touch sensation LANGERHANS’ cells - migrate from red bone marrow to the stratum spinosum of the epidermis; macrophage-like cells that provide an immune response against foreign cells that invade the body surface (fig. 5.2) (7th edition)
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Melanocytes although darker-skinned people have darker melanin and more pigment in their skin, they do not have more total melanocytes in their skin; it is a case of their melanocytes being more active ; melanin can build up in the skin in response to the sun’s UV rays - a process known as tanning (tanning can lead to skin damage!) Protect yourself at the beach http://www.flickr.com/photos/18186551@N02/2045966400/ (7th edition)
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2 - UNIT 2 The Integumentary System Skin Appendages of Skin...

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