Answer:
I think the answer would be guanine and adenine
Heart Rate. ... Some of the blood pumped by the heart travels to the lungs to get rid of carbon dioxide and pick up oxygen. The increase in heart rate stimulates your breathing rate. With an increase in heart rate, your blood pumps through your muscles at a faster rate, leaving less time for oxygen uptake.
Answer:
its called a membrane
Explanation:
its kind of like a cell wall