Bellringer Unicellular Organisms http://www.teachersdomain.org/resource/tdc02.sci.life.stru.singlecell/ Discussion Questions: How does the actual size of the unicellular organisms you are looking at compare with that of a familiar object? What do these unicellular organisms have in common? How do they differ from one another? What characteristics do these unicellular organisms share with multicellular organisms such as insects, birds, squirrels, and humans? How do unicellular organisms get their nourishment? How do they get water? How do they get oxygen? How do they get rid of wastes?

Basic Structure of a Cell

Introduction to Cells Cells are the basic units of organisms Basic types of cells: Bacterial Cell Animal Cell Plant Cell

Number of Cells Organisms may be: Unicellular – composed of one cell Multicellular- composed of many cells that may organize

Different kinds cells white blood cell Amoeba red blood cell cheek cells sperm nerve cell muscle cell Amoeba Paramecium

Levels of organization Cells are grouped together and work as a whole to perform special functions

Tissue A group of similar cells to perform a particular function Animals : epithelial tissue, muscular tissue Plants : vascular tissue, mesophyll

Organ Different tissues group together to carry out specialized functions Heart : consists of muscles, nervous tissue and blood vessels Leaf : consists of epidermis, mesophyll and vascular tissue

The Structures of a Leaf (Plant Organ) Chloroplast Palisade Mesophyll Cell Spongy Mesophyll Cell Air Space Stoma

The Structures of a Heart (Animal Organ)

System Several organs and tissues work together to carry out a particular set of functions in a co-ordinated way Human : digestive, respiratory, excretory, circulatory and reproductive systems Plant : root and shoot systems

Human Body Systems Examples of systems : Digestive System Respiratory System Circulatory System Nervous System Reproductive System

Examples of a Human Body System

Examples of a Human Body System

Examples of a Human Body System Nervous System

Levels of Organization CELLS (muscle cells,nerve cells) TISSUES (muscle, epithelium) ORGANS (heart, lungs, stomach) SYSTEMS (circulatory system) ORGANISM (human)

It’s You!

Cell Analogy In a far away city called Grant City, the main export and production product is the steel widget. Everyone in the town has something to do with steel widget making and the entire town is designed to build and export widgets. The town hall has the instructions for widget making, widgets come in all shapes and sizes and any citizen of Grant can get the instructions and begin making their own widgets. Widgets are generally produced in small shops around the city, these small shops can be built by the carpenter's union (whose headquarters are in town hall). After the widget is constructed, they are placed on special carts which can deliver the widget anywhere in the city. In order for a widget to be exported, the carts take the widget to the postal office, where the widgets are packaged and labeled for export. Sometimes widgets don't turn out right, and the "rejects" are sent to the scrap yard where they are broken down for parts or destroyed altogether. The town powers the widget shops and carts from a hydraulic dam that is in the city. The entire city is enclosed by a large wooden fence, only the postal trucks (and citizens with proper passports) are allowed outside the city.