Levels of structural organization

CHEMICAL LEVEL:

At the chemical level atoms combine to form molecules. From there, molecules then join in certain ways to form organelles, basic components of microscopic cells. Cells are the smallest units of living things which brings us to our next level, the CELLULAR LEVEL.

CELLULAR LEVEL:

All cells have common functions it individual cells differ in size and shape. The simplest living creatures are composed of singles cells, however, in complex organisms like humans, the pyramid of structural organization progresses to the next level, which bring us to the TISSUE LEVEL.

TISSUE LEVEL:

Tissues are groups if similar cells that have a common function. The four main tissue types in the human body are epithelium, muscle, connective tissue, and nervous tissue.
Connective tissue supports and protects body organs which brings us to our next level, the ORGAN LEVEL.

ORGAN LEVEL:

The organ level is where very complex functions become possible. Each organ of the body is a specialized function center responsible for a necessary activity that no other organ can perform.

ORGAN SYSTEM LEVEL:

Organs that work together to achieve a common purpose make up an organ system.

ORGANISMAL LEVEL:

The highest level of organization is the ORGANISMAL LEVEL(the living human being). The ORGANISMAL level represents the sum total of all structural levels working together to promote life.