The heart is the system’s pump and the blood vessels are like the delivery routes and it is a muscle. The pumps are the beat.
The heart is a muscle about the size of a fist and it is the muscle in the body that works the hardest.
The statement that the heart muscle rests only between beats is true.
Virus and bacteria are the suedes that cause it
Answer:
start skating in hilly areas
Explanation:
it would make skating more difficult, hence increasing the intensity.
According to google radiation negerlein and nutrients
