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HIV destroys T-cells
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What if a cell has a lower concentration outside the cell?
There are two basic ways that individual molecules can enter (or leave) a cell.1. Diffusion. This is the movement of particles from a region of high concentration to a region of low concentration. So if the concentration of the molecule is higher outside the cell it can enter by diffusion. However diffusion can only take place down a concentration gradient ie from a high to a low concentration.2. Active transport. This is the movement of particles against their concentration gradient (ie from a low to a high concentration), using energy provided by the cell (ie ATP produced by respiration). So if a molecule is at a higher concentration inside the cell it can only be absorbed by active transport.
What will the The two-point threshold do as the concentration of touch receptors Meissner's corpuscles increases and the skin area becomes more sensitive?
the two point threshold will decrease
What is the behavior of cells in isotonic solution?
An isotonic solution is one in which the ionic environment is similar to that of the cytoplasm. Hence, when a cell is placed in an isotonic solution, there is no net diffusion of water into or out of the cell. The cell remains intact.
What does steep gradient mean?
It means that there is a large difference in the concentration of a certain ion between two different locations. In cells the concentration gradient usually refers to the difference in concentration of ions inside of the cell compared to outside of the cell.
How is a hypertonic solution different from a hypotonic solution?
Hypotonic solution has much less particles dissolved inside the solvent than there is in the cell floating in the mixture. A hypertonic solution has a greater concentration of particles dissolved in the solvent than inside the cell.
What are two ways you can decrease the concentration of a solution?
Well, a solution is made of a solute dissolved into a solvent, so you could decrease the concentration either by adding more solvent ("watering it down") or removing some solute.
What kind of environments causes water to enter or leave the cell?
Water Movement across a cell membrane is called Osmosis. And it is dependent on the concentration of ions on each side of the cell membrane. If the concentration is higher on the inside of the cell water rushes in to dilute the ion concentration and get it to equal the outside concentration of ions and this is called hypotonic. If the concentration is higher outside the cell water will rush out of the cell to help dilute the concentration outside the cell and get the two concentrations to become equal and is called hypertonic. If the concentration is equal in both outside and inside the cell there will be no water movement and is called isotonic. Osmosis
What if a cell has a lower concentration outside the cell?
There are two basic ways that individual molecules can enter (or leave) a cell.1. Diffusion. This is the movement of particles from a region of high concentration to a region of low concentration. So if the concentration of the molecule is higher outside the cell it can enter by diffusion. However diffusion can only take place down a concentration gradient ie from a high to a low concentration.2. Active transport. This is the movement of particles against their concentration gradient (ie from a low to a high concentration), using energy provided by the cell (ie ATP produced by respiration). So if a molecule is at a higher concentration inside the cell it can only be absorbed by active transport.
What will the The two-point threshold do as the concentration of touch receptors Meissner's corpuscles increases and the skin area becomes more sensitive?
the two point threshold will decrease
What are the two things needed for osmosis to take place?
Partially permeable membrane(visking tubing) and water
How does water leave a cell when placed in salt water?
osmosis, which is diffusion of water across a membrane from an area with lower solute concentration to an area of higher solute concentration to equalize the concentration on both sides of the membrane.
What is the behavior of cells in isotonic solution?
An isotonic solution is one in which the ionic environment is similar to that of the cytoplasm. Hence, when a cell is placed in an isotonic solution, there is no net diffusion of water into or out of the cell. The cell remains intact.
What happens when there is a higher concentration of water outside the cell than inside the cell?
Water moves into the cell by osmosis along the concentration gradient until the two gradients are equal. The result is that the volume inside the cell increases, causing the cell to swell.
What are the effect of different concentration of salt solution on red blood cells?
In water - they will swell and explodeIn salt water - they will shrinkIn isotonic solution - they will be fineThis is because of osmosis, water will travel wherever there is a higher concentration of minerals, hence the cells swelling in water.
What Israeli prime minister spent two years in a Russian concentration camp?
Menachem begin
What is the of definition omasis and an exsample?
movement of a solvent (as water) through a semipermeable membrane (as a living cell) into a solution of higher solute concentration that tends to equilize the concentration of solute on the two sides of the membrane.
What does steep gradient mean?
It means that there is a large difference in the concentration of a certain ion between two different locations. In cells the concentration gradient usually refers to the difference in concentration of ions inside of the cell compared to outside of the cell.
