2. February 23, 2015 Aim #09: How do cells arrange themselves? Do Now: Read page 52 in text How long is a single nerve cell in your leg?? Which is bigger, a red blood cell or a human egg cell? H.W. Color Cell Due Wednesday Field Trip March 20 th, 2015 Finish Form Fits Function handout by tomorrow

5. Cells make up all living things.

6. More info on size of cells the Ostrich egg is the largest cell on Earth It is about the size of a football mycoplasma bacterium is the smallest cell in the world. It is only ten micrometers

7. Some Random Cell Facts The average human being is composed of around 100 Trillion individual cells!!! It would take as many as 50 cells to cover the area of a dot on the letter “ i ” Cells are the smallest units of living things that can perform all of the basic life processes WOW

8. Examples of cells Red Blood cells Human Nerve cell Muscle Cells Sperm Cells

9. Cells: Size & Shape Size and Shape depend upon its function. a) Red blood cells are small and disc shaped to fit through the smallest blood vessel. b) Muscle cells are long and thin. When they contract they produce movement. c) Nerve cells which carry signals to the brain are very long. d) Sperm cell have round bodies with whip like tails that swim to fertilize egg cells

10. What is the definition of a cell? The basic unit of life.

11. Cells produce tissues Tissues produce organs Organs produce organ systems Organs systems produce organisms

12. Tissues, Organs, & Systems Cells that work together to perform a specific function form a tissue. Just as cells that work together form a tissue, tissues that work together form an organ. Organs that work together to perform a function form a system. Example: circulatory system. Plant cells also form tissues, such as the bark of a tree. And plant cells work together, forming organs, such as roots and leaves.

13. Multi-cellular Organisms Plant cells Have specialized cells (like people and other animals) that might make up roots or stems. Groups of similar cells form tissue Tissue works together as an organ Organs works together as an organism