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CH1Positive and Negative Feedback Negative Feedback oBody is brought back to homeostasisExampleBody TemperatureoFeedback LoopReceptorsTemperature receptors in skin and hypothalamus Information affects and send signalsEffectorsSweat glands in skin increase secretion & blood vessels dilateHomeostasisNormal Temperature is restored Positive FeedbackoBody is moved away from homeostasisIf there is a stimulus, the response increasesExampleoBlood Clotting, Milk production, Childbirth HomeostasisoAll body systems working together to maintain a stable internal environmentBody CavitiesSerous membranesoLines body cavities & covers organsParietal LayerLines cavityVisceral LayerCovers organsThoracic CavityoPleural CavityContains 1 lungEncased by the pleuraoMediastinum Center of the thoracic cavityContains all organs between the lungsoPericardialContains the heart in the mediastinumEncased by the pericardium Abdominopelvic Cavity
oPeritoneal CavityChamber within the abdominopelvic cavityoRetroperitoneal Contains the pancreas, kidneys, ureters, & parts of the digestive tractoDiaphragm Divides the thoracic and abdominopelvic oPelvic CavityInferior portionReproductive organs, rectum, and bladderCH4: Histology TissuesCells embedded in extracellular matrixo2 or more tissues is an organThree Germ LayersoEndodermoMesodermoEctoderm4 Types of TissuesoEpithelial TissueCovers exposed surfacesLines internal passagewaysForm glandsEpithelial cells can secrete into glandsApical & Basal SurfacesPolarityAvascularNo blood source RegenerateFunction to Epithelial TissueControls what goes in and out the skinProtectionGlandular EpitheliumoEx. Mucus & sweatGap JunctionsAllow rapid communicationoHeld together by channel proteinsPoresoAllows small things to pass between neighboring cellsSomething dissolved in tissueDesmosomesDense areas
oSpot DesmosomesTie cells together Allow bending & twistingoHemidesmosomesAttach cells to the basal laminaBasement MembraneLamina Lucidao“Clear Layer”oresponsible for ½ of the basal layeroBarrier to proteinsLamina Densao“Dense Layer”othick fibersoproduced by connective tissue oStrength & FilterationMaintenance & RepairGerminate CellsoStem CellsoNear basement membraneoIf damaged, cells can create new onesTypes of Epithelial TissueSimple SquamousoAbsorption & DiffusionStratified SquamousoProtects against abrasions, pathogens, and chemicalsoThickest oKeratinized & UnkeratinizedSimple CuboidaloSecretion & AbsorptionStratified CuboidaloSecretion, protection, & absorption Simple ColumnaroProtection, Secretion, & AbsorptionStratified ColumnaroProtectionoConnective TissueFunctions