Question

Match each of the following types of membrane transport with the correct example (some answers may be used more than once): Calcium is moved out of a cell to the extracellular fluid where the solution of calcium is hypertonic Glucose moves from high concentration in the extracellular fluid around a capillary to an area of lower concentration near a cell A cell with 18 sodium molecules outside and 3 inside moves three of the sodium molecules out while using ATP Water moves from inside a cell where there is a hypotonic solution to the extracellular fluid Estrogen moves from inside a cell that produces a lot of estrogen into the extracellular fluid Calcium is pumped out of a cell using the concentration gradient of sodium, which is higher on the outside than inside Serotonin is pumped into a cell against its concentration gradient using the natural inward movement of sodium Glucose moves with its concentration gradient through a cell membrane

Answer 1

1. Given that calcium is moving out of the cell where it's solution is hypertonic that means calcium is moving outside the cell opposite to its concentration gradient. It's well known that in order to move any molecule opposite to its concentration gradient we need to provide some energy. So it's answer will be primary active transport.

2- glucose is moving from its higher concentration to its lower concentration. So the answer will be simple diffusion.

3- same as the case of the first one. Here sodium concentration is more outside the cell and less inside the cell. Still sodium molecules are moving outside the cell using the ATP. So the answer will be primary active transport.

4- hypotonic solution of water means the solution has less amount of solute as compared to the outside environment. So water has to move outside to make the solution isotonic. So the answer will be Osmosis

5- given that Estrogen moves from inside the cell where it has high concentration to outside the where it has lower concentration so its a simple diffusion that will drive the movement of Estrogen outside the cell.

6- Given that calcium is moved out of the cell and to balance the charge imbalance sodium is moved inside the cell. It's a so the answer is secondary active transport - antiport.

7- serotonin is moving inside the cell and sodium is facilitating its import along with its transport inside the cell. So the answer is secondary active transport - symport.

8- glucose is moving from its higher concentration to its lower concentration. So the answer will be simple diffusion