Hypothesis: Because of smaller cells having less volume and surface area, higher diffusion rates will be found in them.

Data Table

1. In terms of maximizing diffusion, what was the most effective size cube that you tested?

Our groups most successful cube that we tested was the smallest one, which had a high SA:V ration of 1.5 and diffusion percent of 76%

2. Why was that size most effective at maximizing diffusion? what are the important factors that affect materials diffuse into cells or tissues?

This size was the most effective at maximizing diffusion bcause it was much smaller than the other cubes. The NaOH was able to diffuse into the agar cube faste than into the larger cubes. This is because the small cube has a high surface area to colume ratio.

3. If a large surface area is helpful to cells, why do cells not grow to be very larger?

In the process of a cell growing, the SA:V ratio changes too, the volume grows at a faster rate compared to surface area. This causes the effectiveness of cells to decrease as it grows, which is why cells stay small. When a cell is very large it has a small surface area to volume ratio, which results in making it harder for the cell to diffuse and allow materials in and out.

4. You have three cubes, A, B, and C. They have surface to volume rations of 3:1, 5:2, and 4:1 respectively. Which of these cubes is going to be the most effective at maximizing diffusion, how do you know this?

The cube that would be most effective at maximizing diffusion would be the cube with the 4:1 ratio. This is because it has a high surface area to enable reactions and a low volme causing reactions to happen faster.

5. How does your body adapt surface area-to-volume rations to help exchange gases?

Our bodies adapt to Surface area to volume rations by using cell shapes that are thin or have a elongate shape. They also fold the cell membrane to assist gas exchange.

6. Why cant certain cells, like bacteria, get to be the size of small fish?

Bacteria is a single cell organism with a high surface area to volume ratio, which is not efficient to be the size of a fish as it would not diffuse materials as well. Once a cell gets to big, it must divide in order to keep its high surface area to volume ratio.

7. What are advantages of large organisms being multicellular?

Large organisms being multicellular will cause a higher diffusion rate in the body. A benifit is that multicellular organisms are able to grow. Mulicellular organisms may have a large SA:V ratio, although they have advantages like gas exchange, our lungs. These functions that multicellular organisms have increase their productivity.