65. Intext question XVII

 

a. DiffusionRespiration is the oxidation process in cellular metabolism, which involves the degradation of food substances to generate energy.

 

b. OsmosisBreathing is the gaseous exchange where there is an intake of \(O_2\) from the atmosphere called expirationinspiration and release of \(CO_2\) called expiration.

 

c. Gas exchange during respiration occurs through diffusionosmosis. During inspirationexpiration, air containing oxygen crosses the lung alveoli through diffusion. Then, it enters the blood and travels to various organs as well as tissues. Here oxygen is exchanged for carbon dioxide.

 

d. The carbon dioxide exits the capillary of the blood, enters the blood and travels back to the heartlungs. This is expired out of the body during expiration.