All living and non-living things are made that one or more 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 also hydrogen (H) is make of H atoms. Atoms integrate to form molecules. Molecules have the right to be little (for example, O2, oxygen gas, which has 2 atoms of the aspect O; CO2, carbon dioxide, which has actually 1 atom the C and also 2 of O), aramuseum.orgium (for example, C6H12O6, glucose, which has 6 atom of C, 12 of H, and 6 of O); or large (for example molecules called proteins are made of hundreds of atoms that C, H, and also O v other facets such together nitrogen (N). Molecules are the structure blocks to all frameworks in the human being body.
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All life structures space made that cells, which are made of countless different molecules. Cells room the smallest independent living point in the human being body. The human body is make of numerous different cabinet types, each with a particular function, (for instance muscle cells contract to move something, and also red blood cells lug oxygen). All person cells room made the a cabinet membrane (thin outer layer) that encloses a jelly-like cellular liquid containing small organ-likestructures dubbed organelles. There room many varieties of organelles, each through a particular function (for example, organelles called mitochondrion provides energy to a cell). Different types of cell contain different quantities and varieties of organelles, depending upon their function, (for instance muscle cells usage a lot of energy and therefore have plenty of mitochondria while skin cells perform not and also have couple of mitochondria).
As in other multicellular organisms, cells in the person body are organized into tissues. A tissue is a group of comparable cells that job-related together to execute a certain function. Over there are 4 main tissue types in people (muscular, epithelial, nervous and connective). An organ is one identifiable structure of the body created of 2 or an ext tissues varieties (for example, the stomach consists of muscular tissue made of muscle cells, which enables it to change its shape, epithelial tissue i m sorry 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 the central nervous system, and connective tissue i m sorry binds every little thing together). Organs frequently perform a details physiological duty (for example, the stomach help digest food). One organ system is a team of guts that work together to carry out a specific function (for example, the stomach, tiny and huge intestines space all organs of the cradle system, that job-related together come digest foodstuff, relocate nutrients right into the blood and get rid the waste). The most facility level the organization, the human organism is created of countless organ solution that job-related together to do the attributes of anindependent individual.
The major levels of company in the body, indigenous the most basic to the most complex 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 \(\PageIndex1\) ordered levels of organization of the human body native the the smallest chemical level to the largest organismal level. Read the description, and examples because that each level in the pyramid: chemical level, to move level, tissue level, organ level, Organ mechanism level, and also Organismal level.