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Chapter 5 Notes

by: Robyn Dixon

Chapter 5 Notes BIOL 1020

Robyn Dixon
Human Biology
Dr. William Heyborne

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About this Document

Tissue Types, Skin layers and cells, Skin Disorders
Human Biology
Dr. William Heyborne
Class Notes
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This 0 page Class Notes was uploaded by Robyn Dixon on Thursday January 28, 2016. The Class Notes belongs to BIOL 1020 at Southern Utah University taught by Dr. William Heyborne in Winter 2016. Since its upload, it has received 15 views. For similar materials see Human Biology in Biology at Southern Utah University.


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Date Created: 01/28/16
Chapter 5 Tissue Types 1 Structure of Skin Cutaneous membrane or integument Covers entire surface of body Largest organ in body Comprised of 4 tissue types i Connec ve ii Muscle iii Nervous iv Epithelial e lntegumentary systems i Skin and accessary organs f Regions i Epidermis 1 Outer thinner region 2 Strati ed squamous epithelial 3 Five layers Strata a Stratum Basale i Super cial to Dermis ii Cells constantly dividing pushing old cells to the surface amp die iii Cells 1 Langerhans cells macrophages a Consumes disease causing organisms 2 Melanocytes a Melanin skin color b Protect from UV radiation iv Sensory Nerves 1 Free nerve endings a Pain and temperature sensations 2 Tactile cells Merkel Cells a Touch sensations b Stratum Lucidum i Only found in thick skin feet and palms ii Protect from constant friction c Stratum Corneum i Cells keratinized hardened ii Prevents against water loss and gain iii Mechanical barrier against microbes bacteria apem ii Dermis Thicker than epidermis Dense irregular connective tissue Collagenous bers prevent tearing a Allows for movement Elastic bers a Stretch to allow movement of muscles and joints 5 Vascularization of dermis supplies oxygen and nutrients to cells of dermis and epidermis UJNl 39 P Chapter 5 Tissue Types iii Hypodermis 1 Subcantaneous layer a Below dermis 2 Loose connective tissue 3 Energy storage 4 Insulation 2 Hair a Everywhere except palms soles lips nipples and portions of external gen aHa b Hirsutism i Excessive body and facial fair in women due to increased production of male sex hormones 1 Not always women c Alopecia i Androgenic 1 Male pattern baldness ii Alopecia Areata 1 Sudden onset of patchy hair loss d Hair Follicles i Formed from epidermal cells ii Located in dermis iii Root hair in follicle iv Shaft hair beyond skin v Arrector Pili Muscle 1 Muscles attached to follicle goosebumps vi Sebaceous gland 1 Produces oil 3 Nails a Formed from specialized epithelial cells b Root base of nail c Body visible portion of the nail d Cuticles fold of skin that hides the root e Epithelial cells becomes keratinized as they move away from the root i Only alive at the root similar to hair f Keratin structural protein 4 Glands a Produce and secrete substances into ducts i Sweat glands ii Sebaceous glands 1 Adjacent to hair follicle b Sweat Glands i Sudoriferous 1 Active under stress ii Apocrine glands 1 Begin at puberty 2 Mammary glands are modi ed sweat glands produce milk iii Eccrine glands 1 Active when body heats up a Helps lower body temperature Chapter 5 Tissue Types 2 Sweat is mostly water but also waste iv Ceruminous glands 1 Produce cerumen earwax c Sebaceous Glands i Associated with hair follicle ii Secretes sebum oil 1 Lubricates and waterproofs hair an 2 Weakens and kills bacteria on skin Ill iv Acne Vulgaris 1 In amed sebaceous glands 5 Skin Disorders a b C Athlete39s Foot i Fungal infection on skin of toes and soles Impetigo i Bacterial infection common in children Psoriasis i Chronic pinkred patches on skin Eczema i In ammation of the skin Dandruff i Dry scalp Urticaria Hives i Allergic reaction Melanoma skin cancer i More likely to be malignant Spreading ii Warning signs moles 1 Asymmetry 2 Irregular border 3 Uneven color 4 Diameter greater than 6mm Most common in fair skinned persons 1 Less melanin protective pigment d skin surface If sebum collects white and black heads form to block UV rays


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