I think its B, im not sure because i need a specific age to determine it fully
Google it maybe pay attention next time
It’s important because your heart must beat faster during exercising because the increase of the heart rate also will need a increase of cardiac output to deliver the necessary blood flow to the muscles.
Hope this help
Answer:
D. Bile
Another thing to note as well is that it also produces Dopamime which is how you get adicted to the substance and makes you feel good. But not in a good way at all.