1. LEVELS OF STRUCTURAL ORGANIZATION
7.L.3B.1 Develop and use models to explain how the structural organizations within multicellular organisms function to serve the needs of the organism.

2. The Human Body- Organism Hierarchy
Is divided into specific levels of organization
Makes the human body a complex organism
FROM SIMPLEST TO MOST COMPLEX
CELLS – TISSUES – ORGAN – ORGAN SYSTEMS

3. Cells Basic units of structure and function in the body
Even though all cells perform the processes that keep us alive, they also have SPECIALIZED FUNCTIONS
Examples:
Nerve cells (neurons)
Blood cells
Bone cells

4. Tissues
A group of specialized cells that work together to perform the same function
4 types of tissues:
Nerve (nervous) tissue
Muscle tissue
Epithelial (skin) tissue
Connective tissue

5. Nerve tissue
Carries impulses back and forth from the brain to the body

6. Muscle tissue contracts and shortens, making body parts move Cardiac
Smooth
Skeletal

7. Epithelial tissue covers the surfaces of the body
Inside, as lining and/or covering of internal organs
Outside, as layer of skin

8. Connective tissue Connects all parts of the body and provides support
Tendons
Ligaments
Cartilage

9. A group of two or more different types of tissue that work together to perform a specific function.
more complex tasks than the tissue
EXAMPLE: the heart is made of muscle and connective tissues which function to pump blood throughout the body. Roots and stems are organs for the flower.
Organs

10. Organ Systems
A group of two or more organs that work together to perform a specific function
Each organ system has its own function but the systems work together and depend on one another.
Example: Plants and animals have reproductive systems

11. Organ Systems ELEVEN organ systems Circulatory Muscular Digestive
Nervous
Endocrine
Reproductive
Excretory (urinary)
Respiratory
Immune
Skeletal
integumentary (skin)