Biology 2 homeostasis

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University of Florida
Biology - Biological Sciences
BSC 2011
Colette Marie St Mary

1.9.13 Different environments have different requirements. Oxygen is much more difficult to take up from water than from air. Heat is conducted at a much faster rate in water than in air. The surface area or volume ratio: rate of diffusion varies with cell size. Much more efficient between small cells because of the smaller space to diffuse through Our bodies are over half water with over 60% of that water being within the cells Homeostasis is the major challenge to survive for organisms Tissue Epithelia: covers surfaces -made up of cuboidal cells; usually densely packed -secretions, absorption, lines blood vessels, connective: bind and support other tissues: blood, bone cariledge and fat -elastin and collagen nervous tissue: transmits impulses- composed of neurons and glial cells muscle tissue: skeletal, cardiac, and smooth - Feedback mechanisms: - Negative and positive - Set point controls the “on off” switch Positive feedback: stimulus leads to a response that leads to a stronger stimulus and stronger response -example is birth and urination(things that must be finished) feed forward information: changes set point in response to the outside stimulus. -example is preparing for a state of hibernation -fever: body t
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