All living and non-living things room made that one or much more unique substances referred to as elements, the the smallest unit of i beg your pardon is the atom, (for example, the element oxygen (O) is made of O atoms, carbon (C) is do of C atoms and also hydrogen (H) is do of H atoms. Atoms incorporate to type molecules. Molecules deserve to be little (for example, O2, oxygen gas, which has 2 atom of the aspect O; CO2, carbon dioxide, which has 1 atom that C and 2 that O), betterworld2016.orgium (for example, C6H12O6, glucose, which has 6 atom of C, 12 that H, and also 6 the O); or big (for instance molecules called proteins are made of hundreds of atoms that C, H, and also O through other aspects such as nitrogen (N). Molecules are the structure blocks come all structures in the person body.
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All living structures are made the cells, which room made of plenty of different molecules. Cells room the the smallest independent living thing in the human being body. The body is do of numerous different cabinet types, each with a specific function, (for example muscle cells contract to move something, and red blood cells bring oxygen). All human cells are made that a cell membrane (thin external layer) the encloses a jelly-like cellular liquid containing tiny organ-likestructures dubbed organelles. There are many species of organelles, each through a particular function (for example, organelles referred to as mitochondrion provides power to a cell). Different varieties of cell contain different amounts and species of organelles, relying on their function, (for instance muscle cells use a the majority of energy and therefore have many mitochondria if skin cells perform not and also have couple of mitochondria).
As in various other multicellular organisms, cell in the person body are organized into tissues. A tissue is a team of similar cells that work together to do a details function. There are four main tissue species in humans (muscular, epithelial, nervous and connective). One organ is one identifiable structure of the body created of two or an ext tissues varieties (for example, the stomach includes muscular tissue do of muscle cells, which allows it to readjust its shape, epithelial tissue which lines both the inner and outer surface ar of thestomach, nervous tissue i m sorry sends and receives signals to and also from the stomach and the central nervous system, and connective tissue i beg your pardon binds everything together). Organs frequently perform a certain physiological function (for example, the stomach helps digest food). One organ system is a group of guts that work-related together to execute a specific function (for example, the stomach, small and huge intestines are all organs of the digestive system, that job-related together to digest foodstuff, relocate nutrients into the blood and get rid that waste). The most complex level that organization, the human being organism is created of numerous organ solution that work together to perform the attributes of anindependent individual.
The major levels of company in the body, from the most basic to the most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, and also the human organism. See listed below Figure \(\PageIndex1\) .
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Figure \(\PageIndex1\) ordered levels of organization of the person body indigenous the the smallest chemical level come the largest organismal level. Check out the description, and examples because that each level in the pyramid: chemical level, moving level, organization level, body organ level, Organ mechanism level, and Organismal level.