1.1.3

Multicellular Organisms

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Hierarchical Order in Multicellular Organisms

Because multicellular organisms are made up of trillions of cells, how they organise themselves is really important.

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Hierarchies

  • There is a hierarchy that helps cells work together to perform complex tasks.
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Tissues

  • When you have more than one cell working together to perform a job, this collection of cells is called a tissue.
    • An example of a tissue in humans is muscle tissue.
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Organs

  • When you have more than one tissue working together to perform a job, this collection of tissues is called an organ.
    • An example of an organ in humans is the heart.
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Organ systems

  • When you have more than one organ working together to perform a job, this collection of organs is called an organ system.
    • An example of an organ system in humans is the circulatory system.
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Organisms

  • When you have more than one organ system working together to perform a job, this collection of organ systems is called an organism.
    • A human is an example of an organism.

Jump to other topics

1Biology

1.1Cells, Tissues & Organs

1.2Reproduction & Variation

1.3Ecological Relationships & Classification

1.4Digestion & Nutrition

1.5Plants & Photosynthesis

1.6Biological Systems & Processes

2Chemistry

2.1Particles

2.2Chemical Reactions

2.3Atoms, Elements, Compounds

2.4The Periodic Table

2.5Materials & the Earth

2.6Reactivity

2.7Energetics

2.8Properties of Materials

3Physics

3.1Energy

3.2Forces & Motion

3.3Waves

3.4Electricity & Magnetism

3.5Matter

3.6Space Physics

4Thinking Scientifically

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