The lungs deliver a regular supply of oxygen to the blood, which is in turn circulated to most all the cells of the body. At the same time oxygen is consumed during aerobic cellular respiration within these cells. This implies that _________.

Question

Quizplus · Accepted Answer

Oxygen will passively diffuse into the cells due to the concentration gradient created by the consumption of oxygen during cellular respiration. As oxygen is used up, the concentration of oxygen is lower inside the cell than outside, allowing for passive diffusion. A is incorrect because the rate of diffusion is dependent on concentration. B is incorrect because the concentration gradient is steeper outside of the cell. D is incorrect because oxygen enters cells through passive diffusion, not active transport.

The Lungs Deliver a Regular Supply of Oxygen to the Blood