Answer the following questions, then use the Submit button on the right to turn in your work.
- Explain what a concentration gradient is and what it means for a molecule to diffuse down the concentration gradient.
- Explain why facilitated diffusion does not require energy from a cell.
- How are receptors and transport proteins similar?
- When a person becomes dehydrated due to the loss of fluids and solutes, a saline solution (water and salts) is infused into the bloodstream by medical personnel. Why is saline solution used instead of pure water?