AP BIOLOGY

Detailed explanation-1: -Gases diffuse through air several thousand times faster than through water. Once oxygen and carbon dioxide reach the network of intercellular air spaces (arrows), they diffuse rapidly through them. Oxygen and carbon dioxide also pass through the cell wall and plasma membrane of the cell by diffusion.

Detailed explanation-2: -Materials like oxygen and carbon dioxide enter and leave cells by diffusion.

Detailed explanation-3: -1)Across cell membranes, oxygen and carbon dioxide move or transport via simple diffusion, and no energy input is required in this process, and on either side of the cell membrane, it is driven by differences in concentration.

Detailed explanation-4: -The carbon dioxide diffuses out of the red blood cells, through the capillary walls, and into the alveolar spaces f exhaled.

Detailed explanation-5: -Inside the red blood cell, oxygen reacts chemically with hemoglobin and is transported by both free and hemoglobin-facilitated diffusion. Oxygen diffuses through the cell membrane and is transported in blood plasma by free diffusion and by convection.