Chapter 5 Integumentary System

Chapter 5 Integumentary System - Chapter 5 The...

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Chapter 5 The Integumentary System Pages 147- 154; 160 – 161; 168--170 Structure of Skin Fig. 5.1 Hair, skin, oil and sweat glands, nails, and sensory receptors. The skin is the largest organ in the body. o Made up of epidermis, dermis, and subcutaneous layer, which has adipose tissue and connective tissue. 1. Epidermis – Superficial and thin. a. Avascular, gets its nutrients from the dermis through diffusion. b. The top layer is dead and is made up of proteins c. Four Principal Cell Types i. Keratinocytes: 90% of epidermal cells and produce keratin. ii. Melanocytes: Produces melanin , which is made from the amino acid tyrosine, which then transfers to the keratinocytes 1. Melanin protects the skin from UV rays which in turn protects DNA and absorbs free radicals. 2. How much melanin is more important than how many more melanocytes there are. 3. When sunburned, DNA is damaged and the melanin failed in protecting and the cell dies. iii.
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This note was uploaded on 12/04/2011 for the course BIO 301 taught by Professor Rupade during the Spring '09 term at Purdue University-West Lafayette.

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Chapter 5 Integumentary System - Chapter 5 The...

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