01:119:116 Lecture Notes - Lecture 12: Extracellular Fluid, Ibm System I, Negative Feedback
23 Apr 2016
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Document Summary
Anatomy = the biological form of an organism. Cells basic unit of structure and function. Tissues groups of cells with similar appearance and common function. Organs different tissues types organised into functional unit. Organ system groups of organs that work together. Size and shape affect the way an animal interacts with its environment[ Must exchange with environment nutrients, waste products, and gases. Substances dissolve in aqueous solution and move across plasma membrane of each cell. Single-celled organisms surface area to volume ratio is sufficient to carry out all exchange. Animal = multicellular exchange must occur across plasma membrane of each cell cells needs access to aqueous environment (in and out) Most animals composed of compact masses of cells with complex internal organisation. Increased number of cell decreases ratio of outer surface area to total volume. Specialised surfaces extensively branched or folded branching increases surface area usually internal so protected. Internal body fluid link exchange surfaces with body cells.
