Week 1 - Book notes - Chapters 1 and 2

Week 1 - Book notes - Chapters 1 and 2 - Physiology Week 1...

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Physiology – Week 1 – Book notes- Chapter 1 and 2 (2-11, 20-46) Anatomy- is the study of internal and external structures of the body and the physical relationships among the body parts (parts) Physiology : study of how organisms perform their vital functionalty (function) Levels of Organization Organism organ system organ tissue cellular Chemical/molecular level Homeostasis: the adjustment of physiological systems to preserve homeostasis (consistent balance in body, stability) **Heart rate, BP, glucose etc Autoregulation: An intrinsic regulation, occurs when activities of a cell, tissue , organ or organ system adjust automatically in response to some environmental Extrinsic Regulation: results from activities of the nervous system or endocrine system, 2 systems which control or adjust the activities of many systems simultaneously o Ex: exercise – nervous system commands heart rate to increase Receptor: sensor that is sensitive to a particular environmental change, STIMULUS Control Center: integration center, receives and processes the information supplied by the receptor Effectors: a cell or organ that responds to the commands of the control center and whose activity either opposes or enhances a stimulus Negative Feedback: The effector, activated by the control center, opposes or negates, the original stimulus. Usually minimizes change Most homeostasis is this! Positive Feedback Initial stimulus produces a response that exaggerates or enhances the change in the original conditions rather than opposing it. Usually increases change
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o Ex: room temp is going up… pos feedback will cause the temp to continue to rise. o Ex: having a baby. . contractions increase CHAPTER 2 Ionic bonds- created by the attraction of cations (+) and anions (-). Covalent bond- sharing electrons (very strong) Sharing one pair = single bond Sharing two pair = double bond (=) Non polar covalent- Between two atoms of the same type (ex: Carbon bonds) Polar covalent Unequal sharing between two different Hydrogen Bonds- weak interaction The attraction of a partial positive charged Hydrogen to a partially negative charged Oxygen or Nitrogen Activation energy- energy needed to start a rxn
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Week 1 - Book notes - Chapters 1 and 2 - Physiology Week 1...

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