Answer :
Answer:
The body regulates the levels of oxygen and carbon dioxide through the respiratory and circulatory systems. When the body needs more oxygen, such as during exercise or physical activity, the respiratory system increases the rate and depth of breathing to bring in more oxygen. At the same time, the circulatory system, specifically the heart, pumps faster to distribute the oxygen-rich blood to the cells that need it. As a result, the pulse rate increases as the heart beats faster. Similarly, when the body produces more carbon dioxide, the respiratory system increases the rate and depth of breathing to exhale more carbon dioxide and bring in more oxygen to balance the levels of the two gases. The changes in pulse rate are a reflection of the body's efforts to maintain a proper balance of oxygen and carbon dioxide and ensure that cells have sufficient energy through respiration.
Explanation: