Question

Lungs serve the purpose of gas exchange. We inhale air, drawing in oxygen (O2) and exhale air, expelling carbon dioxide (CO2). Both of these molecules are small and nonpolar, and therefore freely pass though membrane bilayers of cells in the lungs. Based on this information, the movement of O2 from the alveoli of the lungs into the bloodstream is an example of

Answer 1

Oxygen enters the bloodstream from the alveoli through a process called diffusion, moving down a concentration gradient without the need for energy.

Step-by-step explanation:

The movement of O2 from the alveoli of the lungs into the bloodstream is a process called diffusion. This occurs because oxygen molecules move down a concentration gradient, from an area where they are in higher concentration in the alveoli to an area where they are in lower concentration in the capillary blood. The gas exchange of oxygen for carbon dioxide is facilitated by the special characteristics of the respiratory membrane, which is optimized for gas diffusion due to its thinness and large surface area.

Answer 2

gas exchange!!!!!!!!!!!!!