The human heart works like a pump sending blood around your body to keep you alive. ... This blood delivers oxygen and nutrients to all parts of your body, and carries away unwanted carbon dioxide and waste products. Your heart and circulatory system works together to deliver blood to your organs so they can function.
Answer:
Morphine and other opioid drugs
Answer:
the answers are A, B, C but I could have missed one
The answer is B, Allergies!