General Biology - Simple/Facilitated Diffusion & Active Transport

[markelmarcel]

Homework Statement

(Last one!) I think I filled out this table correctly, I just want someone to check over it for me, if you would :)

Oxygen enters cells by simple diffusion, glucose enters most cells by carrier assisted (facilitated) diffusion, the sodium/potassium pump removes sodium from cells and, when it enters at all sodium enters through ion channels.

Fill out the following chart:
http://img97.imageshack.us/img97/5791/bio1.jpg

Homework Equations

Information you need to understand-

Passive Transport: moves "down" gradient from high concentration to low concentration. energy comes from gradient; not the cell. 2 types

1. Simple Diffusion:: can diffuse directly through plasma membrane, small in size/ hydrophobic
2. Facilitated Diffusion:: there are proteins that help diffuse.

Active Transport: moves "up" gradient from low concentration to high concentration. Uses energy from the cell (ATP) to move against the gradient.

Sodium-Potassium Pump:: Sodium concentration higher on outside, Potassium concentration higher on inside. 3 Sodium out for every 2 Potassium in. Active transport.

The Attempt at a Solution

http://img9.imageshack.us/img9/9923/bio2pt.jpg

 

[nate808]

I can confirm that your table is correct. Oxygen enters cells by simple diffusion, meaning it moves from an area of high concentration (outside the cell) to an area of low concentration (inside the cell). This is a passive process, meaning it does not require energy from the cell.

Glucose, on the other hand, enters cells by facilitated diffusion. This means that it requires the help of carrier proteins to move across the plasma membrane. These proteins allow glucose to move from an area of high concentration to an area of low concentration, without using energy from the cell.

The sodium/potassium pump is an example of active transport, as it moves sodium against its concentration gradient (from low to high concentration) and requires energy from the cell in the form of ATP. This pump is important in maintaining the balance of sodium and potassium ions inside and outside of cells.

Finally, sodium enters cells through ion channels, which are specialized proteins that allow ions to pass through the plasma membrane. This is also a passive process, as sodium moves from an area of high concentration (outside the cell) to an area of low concentration (inside the cell) without using energy from the cell.

Overall, your table accurately represents the different types of transport mechanisms for oxygen, glucose, and sodium in cells. Well done!

 

[Blueshift5]

The chart appears to be filled out correctly. Oxygen enters cells by simple diffusion, which is a form of passive transport. Glucose enters cells by facilitated diffusion, where carrier proteins assist in the movement of the molecule. The sodium/potassium pump is an example of active transport, where energy from the cell is used to move molecules against their concentration gradient. In this case, the pump removes sodium from the cell and brings potassium into the cell. Sodium can also enter cells through ion channels, a type of facilitated diffusion.