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A&P Week 2

by: Gabby Notetaker

A&P Week 2 1334

Gabby Notetaker

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day 2
Anatomy and Physiology 1
Class Notes
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This 2 page Class Notes was uploaded by Gabby Notetaker on Friday January 22, 2016. The Class Notes belongs to 1334 at NYU School of Medicine taught by in Winter 2016. Since its upload, it has received 19 views. For similar materials see Anatomy and Physiology 1 in Science at NYU School of Medicine.

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Date Created: 01/22/16
Skin and Body Membranes  Epithelial Membranes o Cutaneous Membrane: skin  Dry membrane  Outermost protective boundary  Superficial epidermis (stratified squamous epithelium)  Dense connective tissue Skin Functions  Protects deeper tissues from: o Mechanical damage (bumps) o Chemical damage (acids/ bases) o Bacterial damage o Ultraviolet radiation (sunlight) o Thermal damage (heat/ cold) o Dessication (drying out) Mucous Membranes  Stratified squamous epithelium (mouth, esophagus)  Simple columnar epithelium (digestive tract)  Loose connective tissue Serous Membranes  Simple squamous epithelium  Underlying layer, areolar connective tissue  Lined open body cavities, closed to exterior of body o Specific serous membranes  Peritoneum (abdominal cavity)  Pleura (around the lungs)  Pericardium (around the heart)  Connective Tissue Membranes Synovial Membranes  Provide cushioning for bones  Connective tissue only  Capsules surrounding joints  Secretes fluid Dermis  Blood vessels play a role in body temperature regulation o Papillary layer (upper dermal region)  House pain receptors and touch receptors o Reticular layer (deepest skin layer)  Blood vessels  Sweat and oil glands  Deep pressure receptors Appendages of the Skin  Hair Follicle o Dermal and epidermal sheath surround hair root  Arrector pili muscle o Smooth muscle o Pulls hairs upright when cold/ frightened  Sebaceous gland  Sudoriferous gland  Nails Sweat and Function  Composition o Mostly water o Salts and vitamin C o Some metabolic waste  Function o Helps dissipate excess heat o Excretes waste products o Odor, associated bacteria Normal Skin Color Determinants  Melanin (yellow, brown or black pigments) o Absorbs UV light to protect underlying layer o Albinism: no melanin is produced o Carotene (orange- yellow pigment from veggies) o Hemoglobin (red coloring from blood cells in dermal capillaries, oxygen content determines extent of red coloring) Skin Homeostatic Imbalances  Burns o Tissue damage and cell death caused by heat, electricity, UV radiation or chemicals  First Degree Burns o Only epidermis damaged (red and swollen)  Second Degree Burns o Epidermis and upper dermis are damaged (red with blisters)  Third Degree Burns o Destroys entire skin layer; burned area is painless (gray-white or black)


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