8. How do the respiratory and circulatory systems work together?
The respiratory and circulatory systems work together through a process known as gas exchange. In the respiratory system, oxygen is taken in through the lungs and carbon dioxide is expelled. The circulatory system then carries the oxygen-rich blood from the lungs to the rest of the body, and carries carbon dioxide from the cells back to the lungs to be exhaled.
This process is facilitated by capillaries in the lungs where oxygen can pass from the air into the bloodstream, and carbon dioxide can pass from the bloodstream into the air. The circulatory system also helps regulate the pH levels in the body by transporting carbon dioxide to the lungs to be exhaled.
Overall, the respiratory and circulatory systems work together to ensure that cells throughout the body receive oxygen and nutrients, while also removing waste products such as carbon dioxide from the body.