Structural Organization of the Human Body – Anatomy and Physiology.pdf

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3/25/22, 12:30 PMStructural Organization of the Human Body – Anatomy and Physiology1/8An Introduction to the Human BodyStructural Organization of the Human BodyLearning ObjectivesBy the end of this section, you will be able to:Describe the structure of the human body in terms of six levels of organizationList the eleven organ systems of the human body and identify at least one organ and onemajor function of eachBefore you begin to study the different structures and functions of the human body, it is helpful toconsider its basic architecture; that is, how its smallest parts are assembled into larger structures.It is convenient to consider the structures of the body in terms of fundamental levels of organiza‐tion that increase in complexity: subatomic particles, atoms, molecules, organelles, cells, tissues,organs, organ systems, organisms and biosphere ((Figure)).Levels of Structural Organization of the Human Body
3/25/22, 12:30 PMStructural Organization of the Human Body – Anatomy and Physiology2/8The organization of the body often is discussed in terms of six distinct levels of increasingcomplexity, from the smallest chemical building blocks to a unique human organism.The Levels of OrganizationTo study the chemical level of organization, scientists consider the simplest building blocks ofmatter: subatomic particles, atoms and molecules. All matter in the universe is composed of oneor more unique pure substances called elements, familiar examples of which are hydrogen, oxy‐gen, carbon, nitrogen, calcium, and iron. The smallest unit of any of these pure substances (ele‐ments) is an atom. Atoms are made up of subatomic particles such as the proton, electron andneutron. Two or more atoms combine to form a molecule, such as the water molecules, proteins,
3/25/22, 12:30 PMStructural Organization of the Human Body – Anatomy and Physiology3/8and sugars found in living things. Molecules are the chemical building blocks of all bodystructures.

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Term
Summer
Professor
McIntyre
Tags
Human Anatomy, Overview of Anatomy and Physiology

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