Observing Diffusion and Osmosis Purpose and Hypothesis: Procedure 1(Surface Area and Cell Size)- *Purpose-How do surface area and cell size affect the rate of diffusion across a cell membrane? *Hypothesis-The cell with the greatest surface area to volume ratio will have the most affective rate of diffusion. Procedure 2(Modeling Diffusion and Osmosis)- *Purpose-How does the molarity of the solution affect the diffusion and osmosis across a semi-permeable membrane? *Hypothesis-The solution will move…

Introduction The diffusion across a cell membrane is a process of passive and spontaneous net movement of small lipophilic molecules. The molecules move from a high concentration to a low concentrated region along the concentration gradient. The result being a point of equilibrium, this is where a random molecular motion continues but there is no longer any net movement. However, there are things that can affect the rate of diffusion, these being temperature, surface area, concentration, size of…

Introduction Water diffuses across the membrane from the region of lower solute concentration (higher free water concentration) to that of higher solute concentration (lower free water concentration) until the solute concentrations on both sides of the membrane are equal. The diffusion of free water across a selectively permeable membrane, whether artificial or cellular, is called osmosis. The movement of water across cell membranes and the balance of water between the cell and its environment are…

Cell membranes are no different. The specific design and structure of plasma membranes allows for the regular function of cells through transportation, facilitating reactions, and several other tasks carried out by the cell membrane and endomembrane system. When put under physical or chemical stress, however, the plasma membrane begins to falter and will eventually become unable to perform its tasks, which are necessary to cell life. Using beet root tissue, the relationship between membrane performance…

life scenario is an example of diffusion. Simple right? When cream is poured into coffee it remains heavily concentrated in the area it was poured at and eventually spreads throughout it. The more the coffee is stirred the quicker the cream spreads even more. Sugar would do the same thing as well. This is an example of how the interstitial fluids work within the bodies of humans. Interstitial fluids that enclose in on a cell would be the cell membrane or the plasma membrane’s doing. It creates a…

The movement of molecules have two forms of transport through the plasma membrane: active transport and passive transport. Active processes require energy, such as ATP, in order for the molecules to be transported. In active transport, the cell administers ATP.i Within passive processes no energy is required and changes n pressure and concentration are the driving forces. Processes such as simple diffusion, facilitated diffusion, osmosis, and filtration are characterized as passive transport, while…

b.)Purpose- The purpose of this experiment is to understand diffusion osmosis. c.)Hypothesis- Slide #1 blood only is isotonic, Slide #2 Blood plus .9% of NaCl is Hypotonic, Slide 3# blood plus 10% of NaCl is Hypertonic and Slide #4 Sheeps blood and dH20 is Isotonic. II.Procedure- a.)Equipment Used- What we need for this experiment 0.9% NaCl Filter paper 4 clean slides 10% NaCl Wooden applicator stick Cover-slips dH20 1 disposable mat Microscope Sheeps blood Disposable gloves…

CHAPTER 1 INTRODUCTION 1.1 Overview The intracellular trafficking between several membranes enclosed organelles and plasma membrane is essential for all living ukaryotic cells. It’s involved in many fundamental cellular processes such as hormone secretion, ciliogenesis, cell migration, and so on. Intracellular trafficking is mostly mediated by membrane-enclosed vesicles which are budded from donor compartments and fused with target compartments. Vesicular transport is observed among most of the…

Transport Across Plasma Membrane The plasma membrane covers all living cells, enabling the cells’ contents to be held together and controls movement of substances into and out of the cell. Plasma membranes are made of phospholipids, proteins and carbohydrates. The phospholipids are essentially made out of two fatty acid chains and a phosphate-glycerol group. They are arranged in a bilayer with the hydrophilic phosphate head facing outwards and the hydrophobic…

The Transport of Substances Across the Plasma Membrane The plasma membrane or, the cell surface membrane, is made almost entirely of protein and lipid. The plasma membrane controls the movement of substances into and out of a cell. It is partially permeable so some substances cross more easily than others. The lipids found in the membrane are known as phospholipids. Phospholipids are fat derivatives in which one fatty acid has been replaced by a phosphate group and…