Introduction to the Human Body:

1. Introduction to the Human Body: ? ? How are our bodies organized? ?

2. Label your foldable… ORGANISM (body) ORGAN SYSTEMS ORGANS TISSUES CELLS

3. What are all living things made of? • All living things are made ofCELLS! (You have billions of cells inside you.) • Cells have specialized jobs, and are organized in your body. • For example, these red blood cells carry oxygen around your body in your blood.

4. How are cells organized? ORGANISM (BODY) • Complex living things are organized into 5 levels. • Cells carry on the processes that keep us alive. Examples: Red Blood Cells Muscle Cells Skin Cells ORGAN SYSTEM ORGANS TISSUES CELLS

5. Cells are organized into TISSUES! • A TISSUE is a group of similar cells that all do the same thing (they have the same function). Examples: Muscle Tissue (Muscles) Nervous Tissue (Nerves) Connective Tissue (Bones) TISSUES CELLS

6. Tissues are organized into ORGANS! • An ORGAN is a structure made of different tissues. • The organ does a specific, complex job. Examples: HeartStomach Brain Lungs ORGANS TISSUES CELLS

7. Organs are organized into ORGAN SYSTEMS! • An ORGAN SYSTEM is a group of organs that work together to perform a major job. Examples: Circulatory System Digestive System Skeletal System ORGAN SYSTEM ORGANS TISSUES CELLS

9. Organ Systems are organized into ORGANISMS! ORGANISM (BODY) • An ORGANISM is a living thing, with organ systems that work together to keep a body alive. Examples: Human Beings ORGAN SYSTEM ORGANS TISSUES CELLS

10. What is HOMEOSTASIS? • HOMEOSTASIS is how your body maintains an INTERNAL BALANCE. • It keeps your body STABLE in spite of changes OUTSIDE YOUR BODY. • Example: Your body keeps CONSTANT TEMPERATURE no matter what the outside temperature.

11. How does your body maintain HOMEOSTASIS? • When you areTOO HOT, your body SWEATSto keep you cool. When you areTOO COLD, your body SHIVERS to keep you warm.