Diffusion

Question

Diffusion

Quizplus · Accepted Answer

Diffusion depends upon the random motion of molecules. It is a passive process that occurs due to the random movement of molecules without the need for external energy.

Answer: C 
 Diffusion is important for moving molecules over large distances in the body. For example, oxygen diffuses from the lungs to the bloodstream and then to the cells where it is needed for cellular respiration.

The other choices are incorrect: 
B) Results in net movement of molecules from regions of high concentration to regions of low concentration. 
D) Does not require energy in the form of ATP to be carried out. 
E) Is not an appropriate choice as both B and D are incorrect.