BIOL 141 Study Guide - Midterm Guide: Threshold Potential, Blood Plasma, Membrane Protein
Document Summary
Homeostasis: actively maintains fairly stable environment, requires energy. Dynamic steady state- interval environment within set range of values. Ex: body temperature, ion concentration, water balance, ph, glucose, metabolism, heart rate, blood pressure equilibrium: internal and external environments balanced and unchanging, all variables in balance and do not change. Co2 + h2o --> h2co3 --> hco3- + h+ set point: ideal high and low limits: acceptable range of change negative feedback loops: resist change and maintain homeostasis stimulus: when blood pressure, temp, or parameter changes. Diffusion and osmosis concentration gradient: when one substance diffuses through another. Tonicity: the ability of an external solution (the ecf) to have an effect on the volume and pressure of the fluid inside the cell (icf) isotonic solution: same, solute concentration of ecf equal to solute concentration of. Ex: 5% glucose in drips in hospital so isotonic hypertonic solution: solute concentration of ecf greater than icf (higher concentration of solute outside the cell than inside).
