1. Cellular Hierarchy S7L2c
Explain that cells are organized into tissues, tissues into organs, organs into systems and systems into organisms.

2. Cellular Hierarchy
Cells (Least complex) Tissues Organs Organ systems Organism (Most complex)

3. Unicellular Only one cell
The single cell carries out all life functions.
Examples
bacteria
amoebas

4. Multicellular Composed of many cells
Cells group together and divide labor
Cells become specialized for specific functions
Cells take on special shapes because of special jobs
Examples
blood cells, nerve cells, liver cells, muscle cells, skin cells

5. Tissues Cells grouped together to perform the same function
Four basic types in the body
Epithelial tissue (skin, ducts, and tubes)
Connective tissue (cartilage and blood)
Muscle tissue (moves bones, digestive organs and heart)
Nervous tissue (carries messages)

6. Organs Several types of tissues grouped together
Usually perform a complex task
Examples
Brain
Heart
Stomach
Lungs

7. Organ Systems
Several organs working together for a particular function
Examples
Digestive system
Circulatory system
Nervous system

8. Examples of Cellular Hierarchy
Examples of Tissues
Examples of Organs
Examples of
Organ Systems
Epithelial
Skin
integumentary
Nerve
Brain
nervous
Connective
Heart
circulatory
Muscle
Biceps brachii
muscular