wound
19. Why does your heart beats faster after a heavy exercise?
A. The heart also did the heavy exercise.
B. The heart brings food and nutrients to the body after exercise.
C. The heart pumps more blood to replace the oxygen used during
exercise.
D. The heart needs more air because the lungs experienced shortness
of breathing
20. How does the nervous system help our body?
A. Nervous system receives and transports messages to the body.​