Semipermeable membrane

In osmosis experiment, water likes to diffuse from an area of low-solute concentration to an area of high-solute concentration. The purpose of the osmosis experiment was to observe the diffusion of solutes and the osmosis of water through a semipermeable membrane, which was dialysis tubing. This experiment was done to examine, if the solution is hypertonic, hypotonic or isotonic. The result of this experiment was that tube 5 and 6 decreased in mass. Tube 2, 3 and 4 increased in mass.…

Positively charged ions are pumped through the membrane creating a slightly more negative atmosphere inside the cell then the outside. This action causes the cell membrane to be polarized. Positively charged ions are kept out and only make it back in through special membrane gate channels which can open and close and these channels are distributed along the axons and dendrites. Changes in the environment stimulate…

How Hemodialysis Work There is all kinds of different health issues in the world we live in now. Diabetes and high blood pressure is the most common ones. Chronic kidney failure is also another health issue that is going on in the world today. Over 26 million American adults have CKD (chronic kidney disease) and millions of others are at increased risk (National Kidney Foundation 1). Now I know you probably wondering what CKD is. Chronic Kidney Failure (CKD) is the loss of kidney function. The…

1. The Karo syrup experiment started with our dialysis tubing bag with Karo syrup in the bag and the initial weight was 11.09 ounces. We left in a beaker of tap water for 45 minutes and the final weight was 17.98 ounces. The dialysis had a semipermeable membrane and the water soaked through the bag of the syrup. This created a solution of water and syrup 2. The plant takes up water by osmosis and starts to swell. The cell wall prevents it from bursting. Animal cells don’t have a cell wall so…

Purpose This lab’s purpose was to experiment how much of a syrup solution would seep through a dialysis bag at different temperatures. Procedure We prepared by filling up three dialysis bags with about 100 mL of a syrup solution. We tied knots on either end and measured the initial mass of the bags. The bags were measured in grams. Then we added water to three different beakers, each being a different temperature. One beaker was room temperature, another was heated to about body temperature…

An organism uses active transport when the molecules it wants to receive or get rid of is too big. So, the cell uses energy to help the molecules move in and out. Active transport moves “ions such as Na+, Ca+, and K+ across the cell membrane,” (Biology Junction). Also, according to this site, active support “moves materials against their concentration gradient from an area of lower to higher concentration,” (Biology…

Some U.S states are not allowing Syrian Refugees in. There are several reason why I think those states should reverse their decision. A lot of areas here in the United States are barren; uninhabited. The Syrian refugees could utilize that unused space. Moreover, the unemployment rate will also drop because the refugees could do the jobs that we don’t want to do. In that way, they will have a source of income and won’t be that of a burden on the U.S economy. Also, I think that America should…

Using salt solutions to observe osmosis in potatoes. D’OnJanea Washington Abstract In the lab we will be using potatoes. Potatoes are members of the family Solanaceae. Solanaceous plants originated in the new world, and the potato and its relatives were first introduced to Europe in the 16th century. The edible part of a potato, the tuber, is derived from the potato stem. It is rich is starch and has some protein just under the skin. These nutrients are stored in the potato and are intended…

the movement of the calcium ions into the terminals of the axon. This will make the synaptic vesicles to bond with the presynaptic membrane, and release their molecules (transmitter) into the synaptic cleft. Some of these molecules will bind to receptor molecules in the postsynaptic membrane. The binding will lead to opening of ion channels in the postsynaptic membrane, meaning that ions will adjust the polarization of the postsynaptic neuron. These events could be enough to begin action…

Essay Final 2) Explain in detail the relationship between the concepts of a hypothesis, theory, and law. Be sure to not only define each word but to discuss the intricacies of how these three concepts are related. You should also include a discussion that explains why a scientist might get offended by someone who refuses to accept the validity of a scientific theory by claiming, “it’s just a theory,” and someone who claims that a hypothesis is an educated guess. A hypothesis is based on prior…