What is the function of an organism


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An organism is the entirety of the interconnected organs in a body, i.e. the entire living being.


Consists of a nucleus (protons, neutrons) + an electron shell (electrons)

  • positively charged ion = cation
  • negatively charged ion = anion


Composed of several atoms, have a membrane (molecules are also composed of several atoms but do not have a membrane: proteins, carbohydrates, fats, vitamins). 


Composed of several organelles, they have a nucleus, cytoplasm, and cell membrane.


Multi-cell associations. Fulfill a common function.

Extracellular fluid

Transport of substances via cell associations


Association of cells / tissue that form a unit. They have a specific function, form and structure. Tissue units that are located in body cavities are referred to as internal organs.


Organ systems

Closely related organs with a common task: e.g. mouth, throat, lungs.

  • Organs that give the body its shape and are important for movement:Musculoskeletal system (muscles, joints, bones)
  • Organs that serve to maintain the body: internal organs / viscera (digestion, circulation, respiration, urinary system, genital organs, defenses, glands)
  • Organs that demarcate the organism from its environment and make contact with it:Nervous system, skin, sensory organs


Consists of thinking, feeling, striving.
The other functions of the body obey it. But the psyche is also dependent on the functioning of all organ systems (e.g. hormone system).