BIOL 1051H Chapter Notes - Chapter 1: Thermostat, Vasoconstriction, Brainstem
Document Summary
Metabolism consists of internal chemical reactions in living organisms. Responsiveness and movement: ability to organisms to sense and react to stimuli. Stimuli: changes in their environment is called responsiveness irritability or excitability. Homeostasis: the ability to maintain internal stability, Development & 2 major processes: any change in form or function over a lifetime of the organism. Differentiation: transformation of cells with no specialized function into cells that are committed to a particular task. Mutations: change in dna structure are irritable, because environmental selection pressures favour the transmission of some genes more than others. Homeostasis: body"s ability to detect change, activate mechanism that oppose it, and thereby maintain relatively stable internal conditions. Claude bernad: observed that internal conditions of the body remain quite constant even when external conditions vary greatly. Dynamic equilibrium: (balanced change) internal state of the body in which there is a set point of average. Negative feedback: fundamental mechanism that keeps a variable close to its set point.
