AP BIOLOGY

Detailed explanation-1: -Carbon dioxide is a waste product of cellular respiration that comes from the carbon in glucose and the oxygen used in cellular respiration. Internal respiration involves gas exchange between the bloodstream and tissues, and cellular respiration.

Detailed explanation-2: -Cellular respiration converts ingested nutrients in the form of glucose (C6H12O6) and oxygen to energy in the form of adenosine triphosphate (ATP). CO2 is produced as a byproduct of this reaction.

Detailed explanation-3: -This is called external respiration. The blood transports the gases to and from the tissue cells. The exchange of gases between the blood and tissue cells is internal respiration. Finally, the cells utilize the oxygen for their specific activities: this is called cellular metabolism, or cellular respiration.

Detailed explanation-4: -During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

Detailed explanation-5: -This process of exchange of O2 from the atmosphere with CO2 produced by the cells is called breathing, commonly known as respiration.