1. The Different Jobs of Cells
Chapter 2 Section 2

2. Choosing the Right Tool
What tool would you use to saw a piece of wood?
The cells in us (a multi-celled organism) are specialized.
Different kinds of specialized cells work as a team to perform the life activities of a many-celled organism.

3. Human cells come in a variety of shapes.
The shape and size of a cell can be related to its function.

4. Types of Human Cells
Fat cells- stores so much fat that nucleus gets pushed against cell membrane.
Skin cells- mostly flat and close together; form a protective layer for your body
Bone cells- surrounded by hard substance made of calcium and phosphorus
Nerve cells- long; have many branches; allows cells to send and receive messages quickly
Muscle cells- long; have many fibers that can contract and relax

5. Each type of cells has a different job.
Plant Cells
Plants have different types of cells in their leaves, roots, and stems.
Each type of cells has a different job.

6. Types of Plant Cells
Stem cells- long and tube-shaped; move water through plant
Root cells- block shaped; do not contain chloroplast
Leaf cells- brick shaped; contain many chloroplasts

7. Cell Organization
Cells are organized into systems that perform functions that keep the organism healthy and alive.
Tissues: Groups of similar cells that all do the same sort of work
Example: muscle tissue is made up of muscle cells. Bone tissue is made up of bone cells.
Organs: different types of tissues working together
Example: stomach is an organ with muscle and nerve tissue
Organ systems: group of organs working together to do a certain job
Example: stomach, mouth, liver, intestines are involved in digestion