Enlightened witnesses can be those who themselves have risen from the depths. Individuals who have overcome great odds and great adversity. Sometimes this is the very thing required to create lasting empathy and feeling. For when we identify, we can extend ourselves that much more.
The Cardiovascular system links all the parts of our body and consists of the heart, blood vessels, and blood. The Cardiovascular system carries needed substances to cells and carries waste products away from cells.
The cardiovascular system delivers blood, nutrients, ions, gases, and heat throughout your body. That is its job, a transportation system. If you are running, it moves oxygen (O2) down to your legs, and moves lactic acid, that chemical that gives your muscles that burning sensation when worked hard, out of your legs.