How does water pass into and out of a cell?

Answer 1

Movement of substance in to and out of the cell membraneSolvent : Water Solute: substance dissolved in water •Concentration gradient : Difference in the concentration of two side - by side •2 types of transport or movement • 1.Passive transport •2.Active transport •1. passive transport : (Down hill) - No energy is needed to move the materials to in and out of the cells -Movement of materials from high to low concentration a) diffusion b) facilitated diffusion c) Osmosis •Diffusion : movement of particle from higher concentration to low concentration Ex: Mixing ink with water Spray deodorant Diffusion continues until both regions have equal numbers of molecules (equilibrium attained, but still movement of molecules continues randomly) Diffusion can occur in both living and non living things b) Facilitated diffusion or selective transport: Diffusion through channel protein Needs no energy to move molecules C) Osmosis : diffusion of water ( H20) through the cell membrane either in to or out of the cell •Osmosis is the diffusion of water (H2O) through selectively permeable membrane Selectively permeable : some substance can pass across them and others cannot Osmosis occurs only in living things When does the water stop moving across membrane ? Water moves across the membrane Until equilibrium is reached. Once it reaches equilibrium water stops moving across membrane Questions 1. If you put a cell in a glass of distilled water which way will the water flow? into cell or out of the cell? Why? In to the cell-since there is more water in the glass than in cell In the above example, is the flow of water osmosis or diffusion Osmosis 2.If a drop of dye is placed in a beaker of water and the dye spreads - is this an example of diffusion or osmosis? Why? Diffusion 3. What are the things can go freely through the membrane? - Lipids because they are non polar just like the inside of the membrane of bi layer - water and oxygen, co2 are very small , so can go through gaps in the cell membrane. 4. What cannot go through the membrane ? - polar things like sugars, amino acids and salts. So, how do polar molecules go through the membrane ? - large polar molecules use protein channels to enter cells 5.If a cell is permeable to a solute or molecule if it has the carrier or channel protein for the substance to be carried across the membrane which direction would it go and how? From high concentration to low concentration by selective diffusion Channel proteins are specific. •A cell is not permeable to a solute if there is no channel protein to carry it across the membrane ( can not get in) Question : if there is a lot of salt out side the cell than the inside the cell and If cell is not permeable to the salt, which way would salt go? why No where ..can't get in because no channel. •If there is lot of salt outside the cell than the inside the cell and if the cell is not permeable to the salt which way would salt go? Out of the cell •Hypertonic : more solutes inside the cell. cell burst or shrink why? cell burst Osmotic pressure : the pressure caused by swelling of cells due to intake of water. On which side of a selectively permeable membrane does osmosis exert pressure. hypertonic or hypotonic or isotonic ?why hypertonic side. •Hypotonic : more solute out side the cell. cell burst or shrink why? cell shrink •Isotonic : when equal solutes inside and out side of the cell why? equal water flow in and out 6. If cell is not permeable - no channels for the solute - then only water can go in or out to balance the solute concentration - if more salt inside cell, water will come in. is it true or false? Cell burst or shrink? True .cell will burst if more salt out side cell, water will go out from the cell. Is it true or false ? Cell burst or shrink? why True .cell shrink •If a cell has lot more salts out side than inside and the cell is permeable to the salt what will happen? water will go out of the cell to balance out of the salt ( more water in the cell than out - and salt cannot move ) •What will happen if water keeps going in to the cell? 1.In plants: - have cell wall and vacuoles - keeps plant cells from bursting If vacuoles are empty of water - plants sag 2. In Animals - no cell walls some have organelles to pump out of water ex: paramecium 3.In humans, concentration of water and ions is usually inside and out side the cell so diffusion is equal. •Active Transport 2. Active transport •The materials move from an area of low concentration to high concentration 2.Needs transport proteins. ( pumps ) 3. Needs energy. Because going against gradient Ex: sodium (Na), potassium (K) pump •Transport proteins or ( pump) pumps sodium ions out of the cell and pump potassium ions in side the cell Out side the cell Low concentration of K+ High concentration of Na+ 3. Vesicular transport : Vesicles moves particles from cytoplasm to out side of the cell through plasma membrane. 2 types of vesicular transport •Exocytosis 2.Endocytosis •1. Exocytosis : the removal waste or materials from a cell by using vacuole is known as exocytosis. During this process, vacuole fuses with cell membrane and releases it's contents out side of the cell. 2. Endocytosis : is the process of capture or taking material in to the cell from out side 3 kinds of endocytosis •Phagocytosis : (Cellular eating) cell membrane wraps around the solid material and engulfs it forming a phagocytic vesicle EX: White cells attack the bad cells and engulfs •2 . Pinocytosis : ( Cellular drinking) occurs when dissolved substances enter the cell. Cell membrane folds inward to form channel allowing liquid inside a vesicle you're welcome ;)

Answer 2

ask someone else I am not smart enough I have to ask someone else to because I don't even know so dont ask me

Answer 3

by difusion