to an area of Law of Diffusion: particles move from an area of __ until __ - diffusion is a __ process. The rate of diffusion is affected by the __ (the difference in concentration of the diffusing molecules between the two regions), the __ of the molecules, and the __ Diffusion in liquid is slower than in gas However, distribution of molecules in cytoplasm is speeded up by an ever-constant flow of the cytoplasm that is called cytoplasmic streaming Three Ways of increasing the rate of diffusion: 1. increase the __ 2. increase the __ 3. __ the size of the diffusing molecules The properties of the cell membrane allow few types of molecules to pass by diffusion: __ -soluble molecules like __ and __ can diffuse directly across because the membrane itself is made of

Law of Diffusion: particles move from an area of **high concentration** to an area of **low concentration** until **equilibrium is reached**.<br /><br />- Diffusion is a **passive** process. The rate of diffusion is affected by the **concentration gradient** (the difference in concentration of the diffusing molecules between the two regions), the **size** of the molecules, and the **temperature**.<br /><br />Diffusion in liquid is slower than in gas. However, the distribution of molecules in the cytoplasm is speeded up by an ever-constant flow of the cytoplasm that is called cytoplasmic streaming.<br /><br />Three Ways of increasing the rate of diffusion:<br /><br />1. Increase the **temperature**<br />2. Increase the **concentration gradient**<br />3. **Decrease** the size of the diffusing molecules<br /><br />The properties of the cell membrane allow few types of molecules to pass by diffusion: **Lipid**-soluble molecules like **oxygen** and **carbon dioxide** can diffuse directly across because the membrane itself is made of **lipids (phospholipids and cholesterol).**<br />