Our circulatory system is also involved in nutrition and it is in charge of delivering blood to the body's tissues through blood vessels.
This blood contains oxygen, carbon dioxide, nutrients and gases.
Our hollow muscle called HEART pumps blood through the body slower or faster depending on how much oxygen our body needs.
Watch these video and you will know how our heart works.
What is blood?
It is a life-sustaining fluid made of:
PLASMA
RED BLOOD CELLS
WHITE BLOOD CELLS
PLATELETS
