9: Cells
- Page ID
- 74125
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- 9.1: Case Study- The Importance of Cells
- We all get tired sometimes, especially if we have been doing a lot of physical activity like these hikers. But for Jasmin, a 34 year old former high school track star who is now a recreational runner, his tiredness was going far beyond what he thought should be normal for someone who is generally in good physical shape.
- 9.2: Discovery of Cells and Cell Theory
- Cells are the basic units of the structure and function of living things. All organisms are made up of one or more cells, and all cells have many of the same structures and carry out the same basic life processes.
- 9.3: Variation in Cells
- Although all living cells have certain things in common, different types of cells, even within the same organism, may have their unique structures and functions. Cells with different functions generally have different shapes that suit them for their particular job.
- 9.4: Plasma Membrane
- The plasma membrane is a structure that forms a barrier between the cytoplasm inside the cell and the environment outside the cell. The membrane protects and supports the cell and controls everything that enters and leaves it.
- 9.5: Connections between Cells and Cellular Activities
- You already know that a group of similar cells working together is called a tissue. As you might expect, if cells are to work together, they must communicate with each other, just as you need to communicate with others if you work on a group project. Let’s take a look at how cells communicate with each other.
- 9.6: Cytoplasm and Cytoskeleton
- The cytoplasm is a thick, usually colorless solution that fills each cell and is enclosed by the cell membrane. Sometimes cytoplasm acts like a watery solution, and sometimes it takes on a more gel-like consistency. A framework of protein scaffolds called the cytoskeleton provides the cytoplasm and the cell with structure.