Sunday, October 25, 2015

2.1 describe the levels of organisation within organisms: organelles, cells, tissues, organs and systems.

In order from smallest to largest....

Organelles

  • Have a specific function inside the cell
  • Made up of small molecules
  • Example: mitochondria, ribosomes, etc. 
Cells
  • The basis of all living things
  • Said to be a functional unit
  • Made up of organelles
  • Examples: red blood cells, white blood cells, etc.
Tissues
  • Made up of many cells
  • Cells serve a common function
  • Examples: muscle tissue, neural tissue
Organs
  • Made up of tissues 
  • Form a large functioning unit
  • Examples: liver, heart, etc.
Organ systems
  • Made up of many organs
  • Serve a common or related function in the body
  • Many organs working together
  • Examples: respiratory system, skeletal system, etc.
Figure 1

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