Question

Be able to predict the direction of movement of water across a membrane in the following examples: 1. A cell placed in a beaker of 10 % Saline. 2. A carrot stick placed in 0.9% NaCl 3. An IV bottle filled with 15% dextrose placed in a brachial vein.

Answer 1

1. when a cell is placed in saline solution, osmosis occurs , which causes the movement of water from the less concentrated to the more concentrated are.

So the water from the cell to the outside , causing the shrinkage.

2.If the carrot is placed in saline solution,the same osmosis occurs, causing the cells to lose water, which causes the carrot to shrivel.

3.The concentration of the solution in the IV bottle is more than the brachial vein, this will cause the fluid from the blood to move into the bottle.

All the above processes are called osmosis.