|SIX LEVELS OF STRUCTURAL ORGANIZATION IN THE HUMAN BODY||
1. Chemical level
2. Cellular level
3. Tissue level
4. Organ Level
5. System Level
6. Organismic level
|A. CHEMICAL LEVEL||
First level of structural organization.
1. Four essential atoms in the body:
2. Atoms combine to form molecules:
|B. CELLULAR LEVEL||
Second level of structural organization.
1. CELLS : Smallest living unit. Are the basic structural and functional units of living organisms.
2. CELLS important because they contain organelles such as the nucleus, mitochondria and rough endoplasmic reticulum, that perform specific functions within the cell that support and sustain life.
|C. TISSUE LEVEL||
Third level of structural organization.
1. TISSUES :
Group of cells and the materials surrounding them, that work together to perform a particular function.
Tissues arise from three embryonic organs known as the ECTODERM, MESODERM, and ENDODERM.
2. FOUR BASIC TYPES OF TISSUE
1. EPITHELIAL TISSUE
2. MUSCLE TISSUE
3. CONNECTIVE TISSUE
4. NERVOUS TISSUE
|D. ORGAN LEVEL||
fourth level of structural organization
1. ORGANS : Structures that are composed of two or more different types of tissues have specific function and recognizable shapes.
2. Examples :
|E. SYSTEM LEVEL||
fifth level of structural organization.
1. SYSTEM : Consist of several related organs that have common function.
2. MAJOR SYSTEMS OF THE HUMAN BODY
a. INTEGUMENTARY SYSTEM
b. SKELETAL S.
c. MUSCULAR S.
d. NERVOUS S.
e. ENDOCRINE S.
f. CARDIOVASCULAR S.
g. RESPIRATORY S.
h. DIGESTIVE S.
i. URINARY S.
j. REPRODUCTIVE S.
k. LYMPHATIC AND IMMUNE SYSTEM.
|F. ORGANISMIC LEVEL||
The sixth highest and largest level of structural organization.
1. It consists of all parts of the body functioning with one another to compromise the total organism or one living individual.
2. Examples :