Cells, tissues, organs and organ systems

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Cells, tissues, organs and organ systems
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Cells

• Cells in multi-cellular organisms are adapted to
  perform a certain job
• Eg muscle cells have fibres inside them which can
  shorten

Cardiac muscle
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Tissues

• Tissues are made of many identical cells
• Eg muscle tissue- in heart this is cardiac

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Organ

• An organ has a specific function (s) to carry out
• An organ is made of several types of tissue
• Eg the heart has muscle tissue, skin tissue
  (endothelial) and nervous tissue

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Organ system

• An organ system is composed of more than one
  organ
• An organ system carries out a specific function
  in the body
• Eg the circulatory system

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The circulatory system

• Function to transport substances around the body
• Consists of the following organs

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Blood
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Heart
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Blood vessels
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Circulatory system

• The function of the circulatory system is to
  transport substances around the body
• Gases -oxygen and carbon dioxide
• Soluble food
• Waste eg urea and carbon dioxide

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