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Chapter 4 Amerman Anatomy and Physiology

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Chapter 4 Amerman Anatomy and Physiology Endoderm - ANS -Inner Layer -Forms lining of digestive tract Mesoderm - ANS -middle layer -forms tissues such as muscle bone blood Ectoderm - ANS -outer layer -forms skin and neuroectoderm Ground substance is located - ANS in the ECF and ISF ECM functions - ANS -resist stretching and compressive forces -directs cells to their proper postitions and holds those cells in place -regulates development and mitotic activity Collagen - ANS -make up 20-25% of all protein in body -Composed of multiple repeating subunits that form a white fibrous protein -resistant to tension Elastic Fibers - ANS -stretch up to one and half times resting length without breaking -once stretched, fibers return to resting length Reticular Fibers - ANS -Thin, short collagen fibers -form a meshwork that supports ground substance and cells.. also to trap foreign cells Ehlers-Danlos syndrome - ANS -abnormal collagen fibers -hyperextensibility of skin,easy bruising,fragility of blood vessels Marfan syndrome - ANS -abnormal elastic fibers -long limbs and fingers,recurrent joint dislocation Epithelial functions - ANS -protection,immune defense,secretion, transport into other tissues, sensation Basement Membrane - ANS -Extracellular -formed by secretions of both epithelium and connective tissue -acellular glue Simple Squamous - ANS -Single layer of flat cells -Diffusion,Filtration, some protection against friction Simple Cuboidal - ANS -Secretion and absorption in kidneys -Secretion in glands and choroid plexus -Movement of mucus out of the teminal bronchioles


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