research laboratory on cellular diffusion

 lab in cell konzentrationsausgleich Essay

п»їDiffusion in Cellular material

Isabel Zak


How can the size of a cell affect the distribution of chemicals through the cell?


The larger the cell is definitely, the more tough it will be for the chemicals to succeed in the center of the cellular, and diffuse throughout that. This is because you will have a higher surface-area to volume ratio in the larger cells, making the centre in the cells further away from the surface. Therefore , when ever dipped in sodium hydroxide, the larger cells will never be dyed pink all the way through such as the smaller cellular material after the eight minutes.


1x1x1 centimeter agar dice

2x2x2 centimeter agar cube

3x3x3 cm agar dice

100 milliliters of salt hydroxide

Eye protection

Petri dish


Time device



Managed to graduate cylinder


Refer to 'Nelson Science Perspectives 10' internet pages 38-39, section 2 . 5; 'What Restrictions Cell Size? '.


All extended hair was tied back, and loose clothing was removed. Goggles were donned at all times, as well as the sodium hydroxide was dealt with carefully to prevent contact with pores and skin, and had not been ingested, as it is poisonous. All of the tests had been preformed while standing, and a well-ventilated area. Practically nothing was eaten or drank during the test.



Length of the attributes


Part of sides


Total Area (mm2)

Amount of Cell


Ratio of surface-area to volume

Distance colour expanded into cube from area

Diffusion Level Per Minute

(depth of dye/time (minutes))




six hundred


several: 5

your five mm (all the way through)

. 5 mm/minute






a few: 10

5 millimeter

. 5 mm/minute






1: 5

your five mm

. 5 mm/minute


Ratio of surface-area to volume


The color change in the cells symbolizes how far in the cells the sodium hydroxide was able to diffuse within eight minutes. The sodium hydroxide diffused into the cells perfectly rate,. 5 mm per minutes. This meant that only the smallest dice, which was twelve mm long on each part was able to always be dyed entirely pink. This is the depth for the centre of the small cell was your five mm form the surface, all of the other cells had a greater distance towards the centre, and would need to become soaked longer for the chemical to diffuse completely. Cell N would need to become soaked for at least 20 minutes, and cell C would need o end up being soaked no less than 30 minutes.

Along with taking longer for the chemicals to diffuse into all of them, the larger cellular material had even more extreme surface-area-to-volume ratios. The larger the cell, the much longer it takes for the salt hydroxide to diffuse totally. The smallest cellular (cell A) had a percentage of simply 3: your five, whereas the largest cell (cell C) had a ratio of 1: 5. The greater extreme the surface-area to volume rate, the more with the cell was left light. If a real cell was faced with this kind of inability to diffuse the necessary nutrients, it will die from the inside out, as the organelles found in the middle would starve, triggering the rest of the cell to die, since their very own functions probably would not be finished. Therefore , cells must continue to be small enough for the nutrients ect., to diffuse through the cellular. With this in mind, the sole cell which usually would have had the capacity to survive may have been cellular A. Due to its minimal surface-area to amount ratio, the sodium hydroxide was able to entirely diffuse, which a real cellular, would have allowed it to carryout the vital features.

The agar dice is a good model for a cellular, as it is extremely pale, which in turn made the pink coloring that the salt hydroxide colored them easy to understand, also considering that the agar is definitely non-toxic, these were easy to deal with. However , seeing that real skin cells have continuously undulating walls to allow for bigger surface area, a real cell may have a very distinct rate of diffusion. As well, this membrane layer is selectively permeable, that this agar dice could not duplicate. A real cell would be able to decide how much or perhaps how little of a compound it desires to allow to, but the agar agar cubes could only...