Organisation

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  • Created by: Ellxsmith
  • Created on: 15-06-19 16:27

StructureDescription Organelle A specialised unit within a cell which performs a specific function Cell The basic building block of all living organisms Tissue A group of cells working together to perform a shared function, and often with similar structure Organ A structure made up of groups of different tissues, working together to perform specific functions Organ system A group of organs with related functions, working together to perform certain functions within the body

The size of their surface, or surface area, defines how quickly they can absorb substances. The size of their volume defines how much of these substances they need.

As multicellular organisms increase in size, they face two problems:

ProblemSolution to the problem Their surface area does not increase as fast as the volume Insufficient surface area to meet their needs Body systems that add additional absorbing area to exchange surfaces Their volume

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