Cells

The Cell The cell is: the basic unit of life It is the simplest unit capable of: Independent existence

The Cell Life functions: cells themselves are what is alive in organis 1. Reproduction 2. Growth/Development 3. Movement 4. Respiration 5. Digestion 6. Homeostasis 7. Respond/adapt 8. Excretion of wastes

The Cell Levels of organization Cells  tissue  organs  organ systems Allows for division of Labor

The Cell 10 Organ Systems Skeletal Respiratory Muscular Excretory Digestive Circulatory Skin Integumentary Respiratory Excretory Endocrine Nervous Reproductive

The Modern cell theory states: 1) Cells are the basic units of structure and function in living things No organism has been found on Earth that shows the attributes of life and is not composed of cells.

Modern Cell Theory 2) All living things are composed of cells Every living thing is either a single cell or a population of cells

Modern Cell Theory 3) All cells come from pre-existing cells Cells arise only by division of living cells “From life, comes life” Process by which cells makes copies of themselves is called mitosis – copies are identical to the original cell

Composition of Cells A. Cells are comprised of 90% water B. Other molecules that make up the cell are: a. Protein (5.0%) b. Carbohydrates (1.5%) c. Nucleic Acids (1.5%) d. Lipids (1.0%) e. Other (1.0%)

Composition of Cells

Types of Cells A. Prokaryotes 1.) Lack a true membrane- bound nucleus 2.) Single-celled a.) bacteria 3.) DNA located within cell

Types of Cells B. Eukaryotes 1. Has membrane-enclosed nucleus a. information center of the cell and contains DNA 2. Single-celled (unicellular) or many-celled (multicellular) 3. Has other membrane bound organelles 4. There are 2 types of Eukaryotic cells

Plant Cell

Animal Cell

Cell Website www.cellsalive.com/cells/3dcell.htm