AP BIOLOGY

Detailed explanation-1: -CO2 is transported in the bloodstream to the lungs where it is ultimately removed from the body through exhalation. CO2 plays various roles in the human body including regulation of blood pH, respiratory drive, and affinity of hemoglobin for oxygen (O2).

Detailed explanation-2: -Nearly all the carbon dioxide produced each day is excreted through the lungs in the expired gas, although the liver is capable of disposing of a very small amount through the anaplerotic carboxylation of pyruvate to oxaloacetate.

Detailed explanation-3: -The volume of air inspired or expired during normal respiration is defined as the tidal volume. The average tidal volume of a healthy human being is 500mL/min. Thus, the amount of carbon-di-oxide given out is 500mL/min.

Detailed explanation-4: -The lungs in the respiratory system excrete some waste products, such as carbon dioxide and water. The skin is another excretory organ that rids the body of wastes through the sweat glands.