Which of the following positively-charged ions is about 28 times more concentrated inside of the cell than outside (useful for the action potential of a neuron)? chloride magnesium bicarbonate potassium calcium
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Which of the following positively-charged ions is about 28 times more concentrated inside of the cell than outside (useful for the action potential of a neuron)?
- chloride
- magnesium
- bicarbonate
- potassium
- calcium
Every cell has an electric potential difference between inside and outside of the cell under the resting condition which makes the inside of the cell more negatively charged as compared to the outside of the cell. This charge difference between inside and outside of the cell is called resting membrane potential and it is separated by the cell membrane and it ranges between -60 to 90 mV. The cell membrane of the cell regulates the movement of ions and molecules crossing inside or out of the cell. As the cell membrane is a phospholipid bilayer, the only molecule which can diffuse through the hydrophobic core is passed without any help but of the molecule, like-charged ions pass through the transmembrane protein, channel proteins, pumps.
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- Information: Osmotic pressure is the pressure that a solvent exerts against a semipermeable membrane, such as a cell membrane. The higher the solute concentration, the lower the osmotic pressure. Red blood cells have an osmotic pressure equal to that of a 0.90% (m/v) solution of sodium chloride and 5.0% (m/v) solution of dextrose. A solution that has a higher concentration that this is called hypertonic; one with a lower concentration is called hypotonic. Osmotic pressure is an important factor affecting cells. Osmoregulation is the homeostasis mechanism of an organism to reach balance in osmotic pressure.Hypertonicity is the presence of a solution that causes cells to shrink.Hypotonicity is the presence of a solution that causes cells to swell.Isotonicity is the presence of a solution that produces no change in cell volume.When a biological cell is in a hypotonic environment, the cell interior accumulates water, water flows across the cell membrane into the cell, causing it to…yeasts are able to produce high internal concentrations of glycerol to counteract the osmotic pressure of the surrounding media. suppose that a sample of yeast cells were placed in a 4% sodium chloride solution by weight. The density of solution is at 25 C = 1.02 g/ml, Molecular weight of solute = 58.44 g/mol, i of glycerol = 1 and R=0.08205 L-atm/mol-K What is the weight of solute in grams What is the moles of solute What is the volume of the solution in liters What is the molarity of the solution What is the value of the temperature to be used to solved for the osmotic pressure of the solution What is the osmotic pressure of solutionThe movement of water through a semipermeable membrane from a region of lower solute concentration to a region of higher solute concnetration is called _________ osmosis diffusion solubility gradient