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BIOL125 - Lecture week 2.docx - Cell – smallest unit of...

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Cell – smallest unit of lifeAll living things are composed of cells, to be living:-Organisation (compartments, systems)-Cellular composition-Metabolism (does it metabolise?)-Responsiveness-Homeostasis-Development-Reproduction-EvolutionHomeostasisHomos = same/similar, stasis = stay stillHomeostasis refers to the body’s ability to maintain a stable internal environmentwithin a narrow present range, relative to a variable external environmentEach bodily structure contributes to keeping internal environment within normallimitsThe EnvironmentInternal environment:oInside our bodiesoMust be kept stableoOur bodies are able to activate physiological mechanisms to keep the internalenvironment stableExternal environment:oGreatly variableoWe have no control over itoOur bodies must respond to itInternal EnvironmentOur cells, what’s inside them and what surrounds themIntracellular fluid (ICF)oFluid inside the cellsExtracellular fluid (ECF)oFluid outside the cells

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Term
Three
Professor
Francesca fernandez
Tags
Homeostasis, Feedback Systems

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