About This Chapter
Cell Membrane Basics - Chapter Summary
The cell membrane controls everything that enters and leaves a cell and maintains cell homeostasis. You will learn about plasma membranes and the fluid mosaic model of cell membrane structure. Endocytosis, exocytosis and active cell transport will also be explained. When you have completed this chapter, you will be able to:
- Identify the different parts of the cell membrane
- Explain the fluid mosaic model of a cell membrane
- Discuss endocytosis and exocytosis
- Differentiate between active and passive transport
- Explain how diffusion and osmosis work
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1. Plasma Membrane of a Cell: Definition, Function & Structure
Cells are made of many crucial parts that work together and perform specific functions. In this lesson, you will learn about the plasma membrane of a cell to gain an understanding of its structure and function.
2. The Fluid Mosaic Model of the Cell Membrane
In this lesson, we will discuss the components of the cell membrane and why the fluid mosaic model paints the best picture of its structure. We'll learn about the roles of the phospholipid bilayer, cholesterol, proteins and carbohydrates.
3. Endocytosis and Exocytosis Across the Cell Membrane
In this lesson, we'll discover how some cells can eat, drink, and digest their dinner through the process of endocytosis and a structure called the lysosome. In addition, we'll learn how a cell can throw out the leftovers across the cell membrane during exocytosis.
4. Active Transport in Cells: Definition & Examples
In this lesson, we'll learn how substances are transported across the cell membrane against the concentration gradient. This might seem like an uphill battle for the cell, but all it takes is a little chemical energy and a few integral membrane proteins to kick off some active transport!
5. Passive Transport in Cells: Simple and Facilitated Diffusion & Osmosis
A cell membrane is selectively permeable - not permeable to everything. In this lesson, we'll talk about methods of passive transport along a concentration gradient, including simple and facilitated diffusion and osmosis.
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