All living and non-living things are made that one or an ext unique substances dubbed elements, the smallest unit of i m sorry is the atom, (for example, the element oxygen (O) is make of O atoms, carbon (C) is make of C atoms and also hydrogen (H) is do of H atoms. Atoms integrate to type molecules. Molecules have the right to be tiny (for example, O2, oxygen gas, which has 2 atom of the aspect O; CO2, carbon dioxide, which has 1 atom of C and also 2 that O), tool (for example, C6H12O6, glucose, which has actually 6 atoms of C, 12 the H, and 6 the O); or huge (for instance molecules called proteins space made of hundreds of atoms the C, H, and O with other elements such together nitrogen (N). Molecules are the building blocks to all structures in the person body.
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All life structures space made of cells, which room made of countless different molecules. Cells space the smallest independent living point in the person body. The body is made of countless different cabinet types, each with a specific function, (for instance muscle cell contract to move something, and red blood cells lug oxygen). All person cells room made the a cell membrane (thin outer layer) that encloses a jelly-like cellular fluid containing small organ-likestructures dubbed organelles. There are many varieties of organelles, each through a particular role (for example, organelles dubbed mitochondrion provides energy to a cell). Different types of cell contain different quantities and varieties of organelles, depending on their function, (for instance muscle cells use a lot of energy and also therefore have countless mitochondria if skin cells do not and have couple of mitochondria).
As in other multicellular organisms, cells in the human being body room organized into tissues. A tissue is a team of comparable cells that job-related together to execute a details function. There are 4 main tissue varieties in human beings (muscular, epithelial, nervous and also connective). One organ is an identifiable structure of the body created of two or an ext tissues types (for example, the stomach includes muscular tissue make of muscle cells, which allows it to adjust its shape, epithelial tissue i m sorry lines both the inner and outer surface ar of thestomach, nervous tissue which sends and receives signals to and also from the stomach and the central nervous system, and connective tissue i beg your pardon binds whatever together). Organs regularly perform a details physiological function (for example, the stomach help digest food). An organ system is a group of organs that work together to execute a specific function (for example, the stomach, little and big intestines room all organs of the digestive system, that work-related together come digest foodstuff, relocate nutrients right into the blood and get rid the waste). The most complex level the organization, the person organism is created of many organ solution that work-related together to perform the functions of anindependent individual.
The major levels of company in the body, from the most basic to the most complicated are: atoms, molecules, organelles, cells, tissues, organs, body organ systems, and the human being organism. See below Figure (PageIndex1) .
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Figure (PageIndex1) hierarchical levels of organization of the human being body native the the smallest chemical level to the largest organismal level. Check out the description, and examples for each level in the pyramid: chemistry level, cellular level, tissue level, body organ level, Organ device level, and Organismal level.