Cells and Tissues. The Smallest Unit of Life. Animal Cell. Size of Bacteria Limited by:. Rate of Diffusion Molecules must move to ‘find’ where they are suppose to be. In a crowded environment, this might take a while unless the space is small. Surface Area
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Molecules move from where they are most abundant (high concentration) to where they are sparse (low concentration).
Exocytosis (stuff from in out
Phagocytosis (BIG stuff from out in)
Functions = Barrier & Secretion
Functions = Structure & Support
Functions = Contraction & Movement
Function = Communication
Tissues Organs Organ Systems