Celi Size and Surface Area to Volume Ra Learning Objectives: LO 2.6: The student

Question

Celi Size and Surface Area to Volume Ra Learning Objectives: LO 2.6: The student is able to use calculated surface-to-volume ratios to predict which cell(s) might LO 2.13: The student is able to explain how internal membranes and organelles contribute to cel eliminate wastes or procure nutrients faster by diffusion. functions. Introduction: All organisms are composed of cells. The size and shape of a cell determines how ell it can deliver nutrients to its interior. Since all cells and organisms depend upon the efficient delivery of gases, nutrients, and other important molecules, the relationship between a cell's surface area and its volume is an important regulating concept. Cells are limited in how large they can be. This is because the surface area and volume ratio does not stay the same as their size increases. Because of this, it is harder for a large cell to pass materials in and out of the membrane, and to move materials through the cell. In this lab, you will make cube shaped models to represent cells. The dimension along one side will be doubled with each model. You will then calculate the surface area, volume, and the ratlo between the two. The surface area and volume are calculated as shown in the figure below Area of side - Length x width Area of Cube- Length x wiathx 6 Volume of Cube-Length x Width x Heligh Questions: 1. List some of the things that cross a cell's membrane. a. b. c. Why is it important that a cell have a large surface area relative to its volume? (In other words, a high surface area to volume ratio.) 2. Cut out and construct the four cell models. Fold and tape into cubes with the tabs to the inside. Measure and record the dimensions in the Table 1. 3. Table 1. Cell Size Comparison Surface Area (cm2) Volume (cm) Surface Area to Volume Ratio (cel) Dimensions (cm) (smallest) _x_s_- (largest)

Explanation / Answer

Polar and non polar substance, carbon dioxide , oxygen can pass through cell membrane

the surface area to the volume ratio gets smaller as the cell gets larger. Thus, if the cell grows beyond a certain limit, not enough material will be able to cross the membrane fast enough to accommodate the increased cellular volume

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