All living and also non-living things are made the one or an ext unique substances dubbed elements, the smallest unit of i m sorry is the atom, (for example, the aspect oxygen (O) is made of O atoms, carbon (C) is made of C atoms and hydrogen (H) is made of H atoms. Atoms combine to form molecules. Molecules deserve to be tiny (for example, O2, oxygen gas, which has 2 atom of the facet O; CO2, carbon dioxide, which has 1 atom that C and 2 that O), centregalilee.comium (for example, C6H12O6, glucose, which has 6 atoms of C, 12 the H, and 6 that O); or big (for instance molecules dubbed proteins are made of hundreds of atoms the C, H, and O v other facets such as nitrogen (N). Molecules room the building blocks come all frameworks in the human body.
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All life structures space made of cells, which are made of numerous different molecules. Cells room the the smallest independent living point in the human being body. The body is make of countless different cabinet types, each v a details function, (for example muscle cells contract to relocate something, and red blood cells bring oxygen). All human cells are made that a cell membrane (thin outer layer) the encloses a jelly-like cellular fluid containing small organ-likestructures referred to as organelles. There room many varieties of organelles, each through a particular role (for example, organelles dubbed mitochondrion provides power to a cell). Different types of cells contain different quantities and species of organelles, relying on their function, (for instance muscle cells use a lot of energy and also therefore have numerous mitochondria if skin cells perform not and also have couple of mitochondria).
As in various other multicellular organisms, cells in the human being body room organized into tissues. A tissue is a team of comparable cells that occupational together to perform a specific function. Over there are four main tissue species in humans (muscular, epithelial, nervous and connective). One organ is one identifiable framework of the body written of 2 or an ext tissues varieties (for example, the stomach contains muscular tissue do of muscle cells, which enables it to readjust its shape, epithelial tissue which lines both the inner and outer surface of thestomach, nervous tissue i beg your pardon sends and receives signals to and also from the stomach and also the main nervous system, and connective tissue i m sorry binds every little thing together). Organs regularly perform a details physiological duty (for example, the stomach help digest food). An organ system is a team of offal that work together to carry out a specific role (for example, the stomach, small and huge intestines room all guts of the digestive system, that job-related together come digest foodstuff, move nutrients into the blood and also get rid that waste). The most complex level the organization, the human organism is written of countless organ solution that work-related together to execute the functions of anindependent individual.
The major levels of organization in the body, from the easiest to the most facility 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 native the smallest chemical level come the largest organismal level. Read the description, and also examples because that each level in the pyramid: chemistry level, moving level, tissue level, organ level, Organ device level, and also Organismal level.