Molecular diffusion

Objective: The objective of this lab is to show how diffusion occurs with different types of osmosis. This is done with varying concentrations of solute. Introduction: To fully understand this experiment you should have a solid basis of background information on a few a topics. The cell membrane, for example, is the flexible barrier which surrounds the cell (see Figure 1). This organelle controls what is able to enter and exit the cell, which is known as selective permeability. The permeability of a cell membrane affects the concentration gradient between the inside and outside of the cell. Figure 1: Structure of the cell membrane A concentration gradient in relation to a cell is the contrast between concentrations divided by the cell membrane. Diffusion has the capability to change the…

As stated in the introduction the hypothesis for this experiment was that the solution beginning with the higher concentration of KMnO4 and placed in water with the warmer temperature will diffuse through the artificial membrane quicker than the solutions beginning with the already diluted solutions and placed in water at a cooler temperature. This occurring because all of the solutions are trying to diffuse to where it is less concentrated because they are eager to diffuse down its…

d. This lab clearly demonstrated that cells maximize surface area to volume ratios. With a greater surface area, diffusion takes place over a larger surface and is much more effective. Cells rely on movement of particles through diffusion to carry out activities. If cells were too big, diffusion would take too long because although there is still a large surface in which diffusion can occur, the large volume catches up to the surface area and requires more diffusion. The .5x.5x.5 cm agar cube…

Gas Exchange Gas exchange is the process in which gases enter and leave a body by diffusion across gas exchange surfaces. Gas exchange is important as it transfers oxygen from surroundings of an organism to individual cells in the organism’s body, needed by the cells for respiration to occur. Carbon dioxide is released. This process produces energy which is essential to an organism for survival. Group 1 – Insects The definition of an insect is any of a group of small and often winged animals…

Due to evolution, varying gas exchange and circulatory systems have developed over time in different types of organisms. They have changed in complexity based upon to sizes and shapes of organisms, as well as their environments. The variation between the gas exchange systems of the amoeba, insect, spider, fish, amphibian, and bird and the variation between the circulatory systems of the cnidarian, planarian, vinegar eel, earthworm, insect, fish, amphibian, and mammal will be discussed in the…

a selectively permeable membrane, and this process can occur in two ways; passive transport and active transport. Passive transport allows substances to cross the membrane without any use of energy, and this includes simple diffusion, facilitated diffusion, filtration, and osmosis. Active transport however, requires the use of ATP, or energy, to move across the membrane. Diffusion is the movement of…

Ribosomes are the actual site of protein synthesis (Marieb P44). The packaging of proteins and other substances that are being ready to be exported out of the cell and into the plasma membrane is done by the golgi apparatus. From there, the plasma membrane has two processes of exportation, active and passive processes. Passive transport has two important processes known as diffusion and filtration, diffusion being most important because it is the means of transportation for every cell in the…

Analysis In part one, the varied amounts of surface area and volume had an effect on the diffusion rates of the trials. The greater the ratio was between surface area to volume, the rate of diffusion would increase as well. For example, in cell three the surface area to volume ratio was 11.5 cm which resulted in a diffusion rate of .30 cm/min while cell one had a surface to volume ratio of 3 cm had a diffusion rate of .015 cm/min. This shows that when the surface area and volume are…

Reservoir Systems consist of a hollow inner core and a polymer membrane, there to control the rate of drug diffusion. Drug diffusion across the membrane is rate limited and controls general drug release rate (Bajpai et al. 2008). For reservoir systems drug release normally remains steady resulting in a zero order profile (Raval, Parikh and Engineer, 2010). Another technology is called the Multiparticulate drug delivery system which consists of microencapsulated granules/beads containing drug…

Amber Rosales Marco Avalos Lab Section 2011. 21 1 October 2015 Diffusion and Osmosis There are many processes and systems that help maintain our body’s homeostasis and ability to function. These processes can be traced right down to a cellular level. However, if a process at this level were to be disrupted, it can create a ripple affect that can target major life functions or cause a long-term illness. It is processes such as Osmosis and Diffusion that contribute to our state of being and…