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Levels Of Organization Smallest To Largest

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Last Updated: 18 October 2020

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Before you begin to study different structures and functions of the human body, it is helpful to consider its basic architecture; that is, how its smallest parts are assembled into larger structures. It is convenient to consider structures of the body in terms of fundamental levels of organization that increase in complexity, such as: chemicals, cells, tissues, organs, organ systems, and organism. Organization of the body is often discussed in terms of distinct levels of increasing complexity, from the smallest chemical building blocks to unique human organism. To study the chemical level of organization, scientists consider the simplest building blocks of matter: subatomic particles, atoms and molecules. All matter in the universe is composed of one or more unique pure substances called elements. Examples of these elements are hydrogen, oxygen, carbon, nitrogen, calcium, and iron. The smallest unit of any of these pure substances is atom. Atoms are made up of subatomic particles such as proton,ss electrons and neutron. Two or more atoms combine to form molecule,s such as water molecules, proteins, and sugars found in living things. Molecules are chemical building blocks of all body structure. Cell is the smallest independently functioning unit of a living organism. Single celled organisms, like bacteria, are extremely small, independently - living organisms with cellular structure. Humans are multicellular organisms with independent cells working in concert together. Each bacterium is a single cell. All living structures of human anatomy contain cells, and almost all functions of human physiology are performed in cells or are initiated by cells. Human cells typically consist of flexible membranes that enclose cytoplasm, water - base cellular fluid, with a variety of tiny functioning units called Organelles. In humans, as in all organisms, cells perform all the functions of life. Tissue is a group of many similar cells that work together to perform specific function. The organ is anatomically distinct structure of the body composed of two or more tissue types. Each organ performs one or more specific physiological functions. An organ system is a group of organs that work together to perform major functions or meet the physiological needs of the body. This book covers eleven distinct organ systems in the human body. Assigning organs to organ systems can be imprecise since organs that belong to one system can also have functions integral to another system. In fact, most organs contribute to more than one system. Organism level is the highest level of organization. Organism is a living being that has a cellular structure and that can independently perform all physiologic functions necessary for life. In multi - cellular organisms, including humans, all cells, tissues, organs, and organ systems of the body work together to maintain the life and health of the organism.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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