Answer
The six levels of structural organization of the human body are chemical, cellular, tissue, organ, organ system, and organismal levels.
Work Step by Step
The Six Levels of Structural organization:
Level 1: Chemical. This is the level of the operation of atoms
and molecules .Atoms are the smallest units of matter.
At this level atoms combine to form molecules ; in
turn. molecules can combine to form organelles.
Level 2: Cellular (cells) .Organelles like plasma membrane,
nucleus, ribosome, endosplasmic reticulum, and golgi
body combine to form cells..
Cells are the smallest units that can
carry out all the essential functions of life
Level 3: Tissue(s) A tissue is a group of similar cells that work
together to carry out special functions.
The major human tissues are epithelium,
connective tissue, muscular tissue, and nervous tissue.
Major functions of tissues:
Epithelium covers and lines surfaces.
Connective tissue supports and protects softer
tissues.
Muscular tissue effects movement.
Nervous tissue is responsible for internal
communication and environmental
awareness.
Level 4: Organ(s). An organ is a complex structure that
comprises at two or more tissues. Organs are
dedicated to carrying out specific functions . Examples
are heart( pumps blood around circulatory system) ;
kidneys ( remove and excrete
wastes from the blood) ; brain (responsible for
consciousness and coordination of body's activities)
; small intestine (absorption of digested nutrients).
Level 5: Organ System : The organ system comes next in the
hierarchy. An organ system is a group of organs that
work together for a common physiological purpose.
The main organ systems of the human body are
integumentary, muscular, nervous, (skin)
cardiovascular, skeletal, endocrine, lymphatic,
reproductive, and digestive system.
Categories of immunological system, and urinary
system are sometime used in the healthcare
professions to complete this listing.
Level 6: Organismal. This is the level of the total organism. It
comprises all the structures that make up a human
body. At this level all structures work together to
maintain life and reproduce.
