All living and also non-living things space made the one or more unique substances dubbed elements, the smallest unit of which is the atom, (for example, the aspect oxygen (O) is made of O atoms, carbon (C) is make of C atoms and hydrogen (H) is made of H atoms. Atoms integrate to form molecules. Molecules have the right to be tiny (for example, O2, oxygen gas, which has actually 2 atom of the aspect O; CO2, carbon dioxide, which has actually 1 atom that C and also 2 the O), ptcouncil.netium (for example, C6H12O6, glucose, which has 6 atom of C, 12 of H, and 6 that O); or large (for example molecules dubbed proteins space made of thousands of atoms that C, H, and O v other facets such as nitrogen (N). Molecules space the building blocks come all structures in the human being body.
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All life structures space made the cells, which are made of many different molecules. Cells are the smallest independent living point in the person body. The human body is made of many different cell types, each through a particular function, (for instance muscle cell contract to relocate something, and also red blood cells lug oxygen). All human being cells space made the a cabinet membrane (thin outer layer) the encloses a jelly-like cellular fluid containing tiny organ-likestructures dubbed organelles. There space many types of organelles, each v a particular role (for example, organelles called mitochondrion provides energy to a cell). Different species of cells contain different quantities and species of organelles, relying on their function, (for example muscle cells use a the majority of energy and also therefore have plenty of mitochondria while skin cells carry out not and have couple of mitochondria).
As in various other multicellular organisms, cell in the human body space organized right into tissues. A tissue is a team of comparable cells that occupational together to carry out a details function. Over there are four main tissue varieties in humans (muscular, epithelial, nervous and also connective). One organ is an identifiable structure of the body written of 2 or more tissues types (for example, the stomach has muscular tissue made of muscle cells, which permits it to change its shape, epithelial tissue which lines both the inner and also outer surface of thestomach, nervous tissue i m sorry sends and also receives signal to and also from the stomach and the central nervous system, and also connective tissue i beg your pardon binds everything together). Organs regularly perform a details physiological duty (for example, the stomach helps digest food). An organ system is a team of offal that job-related together to execute a specific function (for example, the stomach, tiny and huge intestines room all guts of the cradle system, that occupational together to digest foodstuff, move nutrients right into the blood and get rid of waste). The most complex level of organization, the person organism is created of numerous organ equipment that work-related together to perform the functions of anindependent individual.
The major levels of company in the body, indigenous the easiest to the most facility are: atoms, molecules, organelles, cells, tissues, organs, body organ systems, and also the person organism. See below Figure \(\PageIndex1\) .
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Figure \(\PageIndex1\) hierarchical levels of organization of the human body native the smallest chemical level to the largest organismal level. Check out the description, and examples for each level in the pyramid: chemical level, cellular level, organization level, body organ level, Organ system level, and Organismal level.