Describe, in bespeak from simplest to many complex, the major levels of organization in the human being organism

All living and also non-living things space made the one or more unique substances dubbed elements, the smallest unit of i m sorry is the atom, (for example, the aspect oxygen (O) is make of O atoms, carbon (C) is do of C atoms and hydrogen (H) is make of H atoms. Atoms combine to form molecules. Molecules can be tiny (for example, O2, oxygen gas, which has actually 2 atom of the facet O; CO2, carbon dioxide, which has 1 atom the C and also 2 the O), tasiilaq.netium (for example, C6H12O6, glucose, which has 6 atom of C, 12 that H, and also 6 that O); or big (for example molecules dubbed proteins space made of numerous atoms of C, H, and O with other aspects such together nitrogen (N). Molecules are the building blocks come all structures in the human body.

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All life structures room made of cells, which space made of numerous different molecules. Cells are the the smallest independent living point in the person body. The human body is make of numerous different cell types, each with a details function, (for example muscle cell contract to move something, and red blood cells bring oxygen). All person cells room made the a cabinet membrane (thin outer layer) the encloses a jelly-like cellular fluid containing small organ-likestructures dubbed organelles. There space many types of organelles, each through a particular role (for example, organelles dubbed mitochondrion provides power to a cell). Different types of cell contain different quantities and varieties of organelles, relying on their function, (for example muscle cells use a lot of energy and therefore have countless mitochondria when skin cells do not and have few mitochondria).

As in various other multicellular organisms, cell in the human being body room organized into tissues. A tissue is a team of similar cells that occupational together to carry out a details function. Over there are 4 main tissue varieties in humans (muscular, epithelial, nervous and also connective). An organ is an identifiable structure of the body written of two or more tissues varieties (for example, the stomach includes muscular tissue make of muscle cells, which permits it to readjust its shape, epithelial tissue i m sorry lines both the inner and outer surface of thestomach, nervous tissue i beg your pardon sends and also receives signals to and from the stomach and also the main nervous system, and also connective tissue i beg your pardon binds whatever together). Organs regularly perform a particular physiological duty (for example, the stomach help digest food). An organ system is a group of organs that job-related together to carry out a specific role (for example, the stomach, small and big intestines space all guts of the digestive system, that work-related together come digest foodstuff, relocate nutrients into the blood and get rid of waste). The most complex level of organization, the person organism is composed of many organ systems that work-related together to carry out the features of anindependent individual.


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

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