UNC-Chapel Hill BIOL 252 - Integumentary System (3 pages)

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Integumentary System

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Integumentary System


Intro to the Integumentary System

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University of North Carolina at Chapel Hill
Biol 252 - Fundamentals of Human Anatomy and Physiology

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1st Edition BIOL 252 Lecture 8 Outline of Last Lecture I Equilibrium II Vision III Sensory Transduction in the Retina IV Generating Optic Nerve Signal V How we Have Different Sensitivities VI Color Vision VII Visual Projection Pathway Outline of Current Lecture I The Skin Its Structure and Function II The Epidermis III The Dermis IV Hypodermis V Skin Coloration Current Lecture I II The Skin Its Structure and Function a Biological harm i Keeps microbes and pathogens out b Chemical harm i Waterproofing helps us to retain water or absorbing too much c Physical harm i Abrasions d Other functions i Vitamin D synthesis ii Sensory reception 1 Pain heat movement pressure light touch iii Thermoregulation 1 Involves all 3 layers of the skin iv Communication 1 Facial muscles skin color changes The Epidermis a Epidermal cell types i Keratinocytes and stem cells make keratin ii Melanocytes These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III 1 Protect against UV light causes DNA mutations iii Tactile cells 1 Sensory receptor for touch iv Dendritic cells 1 Fight off microbes and bacteria for the immune system 2 First line of defense for body after the skin so 2nd line of defense 3 Signals to the rest of the immune system b Keratinized stratified squamous epithelium i Desmosomes strong mechanical linkages ii Stratum basale bottom most level iii Stratum spinosum 1 Spiny because beginning to dehydrate iv Stratum granulosum 1 Beginning process of cells dying start to become functional 2 Become dehydrated lose organelles 3 By the time they come to stratum corneum cells DEAD v Stratum corneum 1 Cells dead continually exfoliate vi Poll Everywhere 1 What is cancer Uncontrolled cell division 2 Which cells are least likely to become a skin cancer a Stratum granulosum b Other three types have naturally dividing cells c Pathology Skin Disorders i Cancers of the epidermis ii 1 Basal Cell

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