Describe, in order from easiest to most complex, the major levels of organization in the human being organism

All living and also non-living things room made that one or an ext unique substances dubbed elements, the the smallest unit of i m sorry is the atom, (for example, the element oxygen (O) is do of O atoms, carbon (C) is make of C atoms and hydrogen (H) is made of H atoms. Atoms combine to kind molecules. Molecules can be tiny (for example, O2, oxygen gas, which has actually 2 atoms of the aspect O; CO2, carbon dioxide, which has actually 1 atom that C and also 2 that O), ubraintv-jp.comium (for example, C6H12O6, glucose, which has actually 6 atom of C, 12 of H, and 6 the O); or huge (for instance molecules dubbed proteins space made of hundreds of atoms that C, H, and O with other aspects such together nitrogen (N). Molecules room the building blocks come all structures in the human being body.

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All life structures space made of cells, which room made of many different molecules. Cells are the the smallest independent living point in the human being body. The human body is made of plenty of different cabinet types, each v a particular function, (for instance muscle cells contract to relocate something, and also red blood cells carry oxygen). All person cells space made that a cell membrane (thin outer layer) that encloses a jelly-like cellular liquid containing small organ-likestructures dubbed organelles. There space many varieties of organelles, each through a particular role (for example, organelles referred to as mitochondrion provides power to a cell). Different varieties of cells contain different amounts and species of organelles, depending on their function, (for example muscle cells usage a the majority of energy and therefore have plenty of mitochondria if skin cells execute not and have few mitochondria).

As in various other multicellular organisms, cell in the human being body room organized right into tissues. A tissue is a team of similar cells that occupational together to do a specific function. Over there are 4 main tissue varieties in people (muscular, epithelial, nervous and connective). An organ is one identifiable framework of the body written of two or an ext tissues types (for example, the stomach has muscular tissue make of muscle cells, which allows it to adjust its shape, epithelial tissue i beg your pardon lines both the inner and outer surface ar of thestomach, nervous tissue i m sorry sends and also receives signal to and also from the stomach and also the main nervous system, and connective tissue i m sorry binds everything together). Organs regularly perform a particular physiological function (for example, the stomach helps digest food). An organ system is a group of organs that work-related together to execute a specific role (for example, the stomach, little and huge intestines space all offal of the cradle system, that work-related together come digest foodstuff, move nutrients into the blood and get rid the waste). The most facility level of organization, the human being organism is created of numerous organ equipment that job-related together to execute the features of anindependent individual.


The major levels of company in the body, native the most basic to the most complicated are: atoms, molecules, organelles, cells, tissues, organs, organ systems, and also the human being organism. See listed below Figure \(\PageIndex1\) .

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Figure \(\PageIndex1\) hierarchical levels of company of the person body indigenous the smallest chemical level to the largest organismal level. Review the description, and also examples because that each level in the pyramid: chemical level, moving level, tissue level, organ level, Organ mechanism level, and Organismal level.