Anatomy & Physiology Study Guide (Based on Your Lecture Notes) Chapter 1: Organization of the Body & Homeostasis Levels of Organization Smallest → Largest Chemical Level Cellular Level Tissue Level Organ Level Organ System Level Organism Level Example: Chemicals → Cells → Tissues → Organs → Organ Systems → Human Body Homeostasis Homeostasis = maintaining a stable internal environment. Fluids of the Body Intracellular Fluid (ICF) = inside cells Extracellular Fluid (ECF) = outside cells Interstitial Fluid = between cells Plasma = fluid portion of blood Blood = 55% plasma Plasma = 92% water Systems That Maintain Homeostasis Nervous System Uses electrical impulses Endocrine System Uses hormones (chemical messengers) Feedback Mechanisms Negative Feedback Returns body to normal. Example: Blood pressure rises Body lowers it back to normal Positive Feedback Continues until an event ends

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