Cell membrane

to demonstrate osmosis and diffusion using model cells. As mentioned, osmosis is when water molecules passively move across a semi-permeable membrane (Russell et al., 2013). In the model cells, the dialysis tubing represents the semi-permeable membrane. Model cell one demonstrates that osmosis occurred because osmosis caused the water to move through the dialysis tubing and into the cell. On the other hand, model cell three showed that a cell would lose water via osmosis in a situation where

permeable membranes. Diffusion is the process in which particles move from an area of high concentration to an area of low concentration. When water enters or leaves a cell, it is called osmosis, which is the same process as diffusion, but solely focused on water. Certain membranes allow only particular chemicals to pass. These are called selectively permeable membranes. The reason substances need to move through cell membranes is to balance out the solutes on either side of the membrane. When the

short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls, following a consistent trajectory. Action potentials occur in several types of animal cells, called excitable cells, which include neurons, muscle cells, and endocrine cells, as well as in some plant cells. In neurons, they play a central role in cell-to-cell communication. In other types of cells, their main function is to activate intracellular processes. In muscle cells, for example, an action potential is

the sun to create sugar for the cells. The whole process is based off of photosynthesis which is established by the chlorophyll molecules in the chloroplast. The chloroplast is one of two things founded in plant cell but not animal cells, the other is the cell wall. The cell wall is a rigid type structure that surrounds the cell membrane and produces support for the cell. However despite their differences they both do share a nucleus, cytoplasm, and a cell membrane. The purpose of completing this

differences between the structure of animal and plant cells In general both animal cells and plant cells have the similar structures, however they do have some differences. Plant cells have a cell wall, this strengthens the cell,it also gives it shape and protects it from infection. Plant cells also have chloroplasts which absorb light energy,this is vital for photosynthesis. Plant cell also have a vacuole, however unlike the ones found in animal cells they are much larger. Vacuoles store food and nutrients

various salt concentrations will have on the rate of osmosis in potatoes. Osmosis is the movement of water molecules from a high water potential to a low water potential through a semi-permeable membrane. All cells have semi-permeable membranes which means that it only allows certain substances in and out of the cell. Many factors effect the rate of osmosis, this includes temperature and the amount of salt added. I think that when the potatoe is placed in a salt concentration where the water potential

for the movement of substances across the plasma membrane, and to indicate the driving force for each. This may also be applied to the study of transport mechanisms in living membrane-bounded cells. Also, understanding of which way substances will move passively through a deferentially permeable membrane depending on the concentration differences. We used PhysioEx software to examine diffusion. In these experiments we used different sized membranes as well as NaCl, urea, glucose, albumin, powdered

If a cell is to perform its functions it must maintain a steady state in the midst of an ever changing environment. This steadiness is maintained by the regulation of movement of materials into and out of the cell. To achieve this control, cells are bounded by a delicate membrane that differentiates between different substances, slowing down the movement of some while allowing others to pass through. The membrane is said to be differentially permeable since not all substances penetrate equally well

photosynthesis, to dissolve nutrients, to help with the regulation of temperature and as a transporter for food and minerals. Nutrients that are absorbed by the plant through active transport (which can be defined as the movement of a substance across the membrane going against the concentration gradient, from low concentration to high concentration) include nitrogen, potassium, phosphorous, sulfur and magnesium. All of which are macronutrient ions meaning they exist as ions in the soil, and then are absorbed

a neuron and label its components. In what ways are neurons specialized for communication? How do these specializations distinguish neurons from other types of cells? The structure of a neuron consist of four main components dendrites, cell body also known as soma, synapse and axon. Dendrites collect signals coming in from other cells. The soma is responsible for assimilating signals coming in from the dendrites in order to create a signal traveling unidirectional through the axon. The axon stems