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In a multicellular organism, an organ is a collection of tissues joined in a structural unit to serve a common function. [1] In the hierarchy of life, an organ lies between tissue and an organ system.
Elements of the human body by mass. Trace elements are less than 1% combined (and each less than 0.1%).; Element: Symbol: Percent mass: Percent atoms: Oxygen O 65.0 24.0 Carbon C 18.5
A biological system is a complex network which connects several biologically relevant entities. Biological organization spans several scales and are determined based different structures depending on what the system is. [1]
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). ...
The "reference" 70 kg human body is estimated to have around 39 trillion bacteria with a mass of about 0.2 kg. [2] [3] [4] [5] These can be separated into about ...