1. The Human Body Tissues Organs Function

2. Organization
Smallest part of the human body that performs all the necessary life functions is ___________
Cells – the smallest unit of life
Tissues – groups of cells with similar structure and function
Organs – groups of tissues organized to perform a particular task
Organ Systems – groups of organs that work together to perform a necessary life function (respiration, circulation, digestion)

3. 4 Types of Tissues Tissue Function Example Picture Muscle Tissue
Moves the body and substances within the body
Biceps; triceps; heart; arterial walls
Nerve Tissue
Transmits messages throughout the body
Brain; nerve cord; neurons
Epithelial Tissue
Covers the surfaces of your body
Skin; lining of digestive system
Connective tissue
Connects or holds together parts of the body
Bone; cartilage; fat; blood; tendons; ligaments

4. Human Body Systems and Their Functions
Organ System
Function
Example
Integumentary
(skin)
Protects; receives stimuli from the environment; helps control body temp; produces vitamin D; removes some waste
Skeletal
Supports and protects the body; allows movement; makes blood cells
Muscular
Moves the body and substances within it
Digestive
Breaks down food into simple nutrients that body cells can use

5. Organ System Function Example Circulatory
Delivers nutrients and oxygen to body cells and carries away wastes from cells
Lymphatic
Helps protect the body from disease-causing organisms
Respiratory
Moves oxygen through the blood and carbon dioxide out of the body
Excretory
Removes cells’ waste products

6. Organ System Function Example Nervous
Receives and transmits messages throughout the body
Endocrine
Controls many body functions to keep the body working properly; coordinates systems
Reproductive
Produces male and female sex cells; female organs nourish and protect developing embryo
Immune
Protects the body against disease-causing organisms and substances