Which of the following is an example of diffusion?
A)movement of individual oxygen molecules from the air to the bloodstream
B)movement of large numbers of air molecules into and out of the lungs
C)transport of oxygen throughout the body by means of the circulatory system
D)binding of oxygen to hemoglobin within the red blood cells
E)movement of oxygen molecules from the lungs to the bloodstream AND movement of large numbers of air molecules into and out of the lungs

Question

Quizplus · Accepted Answer

Diffusion is the movement of individual molecules from an area of higher concentration to an area of lower concentration. In this case, the individual oxygen molecules are moving from the air (higher concentration) to the bloodstream (lower concentration), which is an example of diffusion. The other choices involve the movement of larger quantities of air or oxygen, or the use of the circulatory system or red blood cells, which do not fit the definition of diffusion.

Which of the Following Is an Example of Diffusion