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Human Body - Coggle Diagram

- - - - Charasteristics
        
        It is made up of numerous nerve cells.
        
        Nerve cells are excitable and respond to external stimuli.
        
        Nerve cells show conductivity by transmitting signals from one cell to the other.
        
        Transmission of signals is through neurotransmitters.
        
        The brain is the major organ.
- - - - charasteristics
      - Respiratory structures typically have an attenuated shape and a semipermeable surface that is large in relation to the volume of the structure. Within them there is usually a circulation of body fluids (blood through the lungs, for example).
      - Charasteristics