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.
C. The kidneys. The kidneys are designed to filter blood, so when they cannot work, hemodialysis must be done so the body can function.
A hormone (A hormone that is released in response to stress that speeds up the heart rate, and can increase blood pressure). I hope that helps you :)
Answer:
je ne compred pas l,anglais
