1. Understanding the Human Body
Anatomy & Physiology:
Understanding the Human Body

2. Definitions Anatomy and physiology are interrelated subjects
Anatomy is the study of the structure of an
organism.
Physiology is the study of the function of an

3. Levels of structural organization3

4. Levels of structural organization
Chemical level
atoms and molecules
Cellular level
Cells: smallest living part of the body
Tissue level
Tissue: group of cells that work together to perform the same task
4 basic tissue types: epithelial, muscle, connective and nervous
Organ level
Organ: group of 2 or more tissue types that work together to perform
a specific function
System level
Organ system: a group of organs working together to preform one of the body’s major functions
sometimes an organ is part of more than one system
Organismal level – the organism OR living thing 4

5. All living organisms are composed of cells
THE HUMAN CELL
All living organisms are composed of cells
The cell is the smallest living part of our body
It is the building block of
our entire body
Cells vary in size, shape
and function
All cells need food, water,
and oxygen to live and
function

6. What is Cell Specialization?

7. Types of tissues
Connective Tissue holds body parts together and connects them. Body parts like bones, ligaments, and tendons are held together by this type of tissue.
Epithelial Tissue covers the internal and external body surfaces. Examples of this tissue are the skin and the linings of internal organs.
Muscle Tissue expands and contracts, allowing the body to move.
Nervous Tissue carries messages from all parts of the body to the central nervous system (CNS).

8. Organs and Organ Systems
have separate and distinct functions, but they rely on one another to perform their tasks
made up of organs