01:119:116 Lecture Notes - Lecture 12: Extracellular Fluid, Body Fluid, Emergence
17 Jun 2020
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Tissues groups of cells w/ similar appearance and common function. Organs different tissue types organized into functional unit. Organ system groups of organs that work together. Size and shape affect the way an animal interacts with its environment. 40: focuses on basic principles of anatomy and physiology. 45: focuses on beginning of the endocrine system: exchange with the environment (ch. Must exchange with environment: nutrients, waste products, and gases substances dissolve in aq solution and moves across plasma membrane of each cell. Single-celled organisms surface area to vol ratio is sufficient to carry out all exchange. Animals= multicellular exchange must occur across plasma membrane of each cells cells need access to aq env (in and out: most animals composed of compact masses of cells w/ complex internal organization. Increased number of cells decreases ratio of outer sa to total volume. Specialized surfaces extensively branched or folded branching increases sa usually internal so protected.
