What is approximately the amount of CO2 in our exhaled air?

The approximate amount of CO2 in our exhaled air is [D] 16%. Exhaled air contains a higher concentration of carbon dioxide compared to inhaled air because CO2 is a waste product of cellular respiration. While inhaled air typically contains about 0.04% CO2, exhaled air can have concentrations ranging from 3-5%, depending on factors such as metabolism, respiratory rate, and environmental conditions. During cellular respiration, cells use oxygen and glucose to produce energy, releasing CO2 as a byproduct. This CO2 is transported via the bloodstream to the lungs, where it diffuses into the alveoli and is then exhaled during expiration. The higher concentration of CO2 in exhaled air reflects the metabolic activity occurring within the body and provides a means for the removal of this waste gas from the bloodstream.